Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f58b43dfaf4118…

MALICIOUS

PDF

84.0 KB Created: 2021-04-02 04:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ad47eed380e375767df1363e43c9ff1c SHA-1: adb9b25a78d2125ca6abd9544b5c77fff4753c43 SHA-256: 61f58b43dfaf4118124225c6cc47dda9e2a6ee75de2e576dc949b435827672ba
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, characteristic of a link farm designed to direct users to potentially malicious websites. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues beyond metadata indicating it was generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://seumenha.ru/wix?keyword=gerardo+medina+estilo+de+vida PDF link annotation
    • https://cdn.sqhk.co/sawowudin/hb2hhha/the_joker_hd_wallpaper_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/bupusudiva/ggiDicJ/playstation_2_emulator_iso.pdfIn PDF document text
    • https://simefaburiso.weebly.com/uploads/1/3/0/8/130814859/nopejavu.pdfIn PDF document text
    • https://puwijupuf.weebly.com/uploads/1/3/4/7/134701632/4a807c6a9bfad58.pdfIn PDF document text
    • https://negorevir.weebly.com/uploads/1/3/4/4/134471844/303004.pdfIn PDF document text
    • https://cdn.sqhk.co/dagozuwemep/eZ21hcd/voltage_drop_meaning_in_physics.pdfIn PDF document text
    • https://nepefiro.weebly.com/uploads/1/3/4/4/134494652/nadikijulag.pdfIn PDF document text
    • https://radefikifuru.weebly.com/uploads/1/3/4/7/134723330/butibuve.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_847f59b5873e4b14bb35ee5f4b5258a5.pdf?index=trueIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_9b863792886645018b02a9979e73f964.pdf?index=trueIn PDF document text
    • https://7292b199-6d7c-4e84-b646-7854114497ba.filesusr.com/ugd/53361e_a65fa76613d54e02a14c88ff9739d95f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/garmin_forerunner_310xt_strap.pdfIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_eff6f11029d0495b9e7ae77dd38ded3f.pdf?index=trueIn PDF document text
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_a1a44b91aed94e33a37f4b6ae8b0ac70.pdf?index=trueIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_7f76ff93af184c95a6df0e16a7aaddb9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/atm_card_apply_form.pdfIn PDF document text
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_7529f8adc8b84f57867bfeda10fe21ab.pdf?index=trueIn PDF document text
    • https://56a79910-2d97-40e4-a1df-bca3b17021d7.filesusr.com/ugd/2721fc_6c21ae5049a14cb99030ebae4050d5af.pdf?index=trueIn PDF document text
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_8deb2672444f46a2ba865ed220bc03f8.pdf?index=trueIn PDF document text
    • https://fecd0c08-032d-4b8b-b26c-6108aca7a00f.filesusr.com/ugd/a87c8b_adf7e5df4e9843828ddc65df6f862860.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD463 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off0000e54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54A 5060 bytes
SHA-256: 69a6f81b9188b7e37f2d19faa540cfa564bf33a18119310bd06a7229b6a621bf
font_02_sfnt_off0000f668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF668 4420 bytes
SHA-256: f81a0a0e03819226e2a182f739983298f2f97bc6db6fc8cbb31e18d4c1e72b83
font_03_sfnt_off00010274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10274 12188 bytes
SHA-256: ea1f7aae9e232681ffde4e0b6384fc19ef23ee883918022e87554eeb17c8f01e
font_04_sfnt_off0001296f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296F 16800 bytes
SHA-256: 787fcb5387e86ac474213cc7d8770bff1ed8f781917cee2dc31e04c73ce715a6

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