Malicious PDF — malware analysis report

Static analysis result for SHA-256 36104b36f19fdf74…

MALICIOUS

PDF

81.0 KB Created: 2021-05-27 00:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: abba808571982f3b495d195f7ad1ed80 SHA-1: d1be5d022c7a5bead30f7b1842cca13f868f4725 SHA-256: 36104b36f19fdf74a24a1026bf13b26d2bbed0f7107f2ae8297888889b2cadcd
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to disposable hosting, and at least one known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to reference a car manual, suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=2015+bmw+428i+convertible+owners+manual In PDF document text
    • https://static.s123-cdn-static.com/uploads/4416139/normal_5ff987c3dcb56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489245/normal_6049aae01a3aa.pdfIn PDF document text
    • https://dedejabo.weebly.com/uploads/1/3/4/8/134875177/fegejodeserude-nubobake-vajexitozeta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466151/normal_60635e3d69484.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366306/normal_5fe384cca55b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393180/normal_5fe4ead61e1fd.pdfIn PDF document text
    • https://kavafarosodox.weebly.com/uploads/1/3/4/0/134097584/8166776.pdfIn PDF document text
    • https://mivebomuponi.weebly.com/uploads/1/3/1/3/131398008/428752.pdfIn PDF document text
    • https://dazutexigamufo.weebly.com/uploads/1/3/2/7/132740900/dolubufewiko-tusovekapo-zaloridikim.pdfIn PDF document text
    • https://titapogesasoja.weebly.com/uploads/1/3/1/3/131380181/5767461.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0f9a7f59-3813-4559-9aa0-2ca62abb04c3/how_to_cite_online_sources_harvard_style.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d6f4e4d-4822-4cc3-94d2-6c7353f0332e/how_to_use_shark_professional_steam_pocket_mop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/281c89ee-7cb8-492d-a3e7-d389975957e5/38714992673.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1375dd23-169f-470a-9ebc-c271c0e3a435/suwuruvotifapumibej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3676f248-beaa-4523-bb82-828da9e7d703/fugexumaxipinutazudugeni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f62130af-66d4-4fab-b12c-c78042af5ba6/the_magic_school_bus_theme_song_instrumental.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1eea4c2-369e-480d-8050-d8e79b5776a7/confessions_of_a_shopaholic_book_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cc02273-93e1-4930-9a70-44e44ed891a0/linadawezamebafodipunalez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/954ae902-5caf-46c6-aa47-c1e9b4c3f9ee/libros_ginecologia_y_obstetricia_descargar_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49ccdabd-f578-4d0f-aee2-541f14d1f0ac/bamuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49016b9b-11f4-4060-9924-d4df5194cac7/belkin_wifi_range_extender_instructions.pdfIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 5756 bytes
SHA-256: cf0588dd0d7b53153a893fc3bbb27b0de0e33937525d912aac534d6c6df408f7
font_01_sfnt_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 11540 bytes
SHA-256: 2775dab5cefdfafd41f239ab7ba3117b45472543f7dcf77ba2b1abea2cba1fb4
font_02_sfnt_off000126cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CB 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3