Malicious PDF — malware analysis report

Static analysis result for SHA-256 d840d88f6656209f…

MALICIOUS

PDF

84.1 KB Created: 2021-04-05 19:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c0a1da181c829ac79607db3ceba7b44d SHA-1: 84844aaeba803f9b8a37d16be72f6b133dec16c3 SHA-256: d840d88f6656209fb02794695bbb441e64d1d44c26107c0cf096c53733cdc100
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or phishing content. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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
  • 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://pelibifir.ru/strik?utm_term=french+vocabulary+nouns+list PDF link annotation
    • http://rm-swis-mine.com/30061992349ctrab.pdfIn PDF document text
    • http://xebepadizupen.22web.org/budebubugidede.pdfIn PDF document text
    • http://biwejobezimije.22web.org/sony_rx10_iv_video_tutorial.pdfIn PDF document text
    • http://jusafajilejeg.22web.org/30151021670.pdfIn PDF document text
    • http://vkysnaya-eda.site/active_listening_tips8zt74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_6816a16e09684664be8df49e75e19964.pdf?index=trueIn PDF document text
    • http://dipusoxitiruvu.rf.gd/civ_6_gathering_storm_leader_guide.pdfIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_c9f4fef9084a43b49f8a647e776e008c.pdf?index=trueIn PDF document text
    • http://ravuxigud.epizy.com/56417606616.pdfIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_861b8ec3ad77429fbec4f6adf66f0c9c.pdf?index=trueIn PDF document text
    • http://xaxotatizomeno.rf.gd/lefewugimu.pdfIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_5e6d78a2184c43dc8720db2d1006d760.pdf?index=trueIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_4060d5d375d94248a6acb72106bce998.pdf?index=trueIn PDF document text
    • https://9462281c-6212-45c1-8f90-c4e3c363a226.filesusr.com/ugd/007d40_cd74ea3279554503a184c1817442833b.pdf?index=trueIn PDF document text
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_8225e759cdf54d37b7be80569c1fe50d.pdf?index=trueIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_8e355274d849448bbe97dfbc48196de4.pdf?index=trueIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_5cd3d933703149a19f87b26e3273f75d.pdf?index=trueIn PDF document text
    • http://mizebonemis.rf.gd/hanuman_bhajan_mp4.pdfIn PDF document text
    • http://rumudawe.epizy.com/bupodovowamolugirikesu.pdfIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_bede63a5626f474ea29baed5c6f2a8cb.pdf?index=trueIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_00e85a4887fb4fbcbe42b837b45a37ac.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
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 5144 bytes
SHA-256: 670776dc52ca7240943c4a17fa6fed02aa63822814f803f3bebca16580a50ed8
font_01_sfnt_off0001093b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093B 7180 bytes
SHA-256: d61b1b8059259e68c1a7cac1cebbaf4493d2b40c766352d20235fba21e20b987
font_02_sfnt_off00011cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAD 11920 bytes
SHA-256: 9761f33f5774f54c68b15f2c78eb6053b04e28db292cd7ba46865837574cdbb8

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