Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a584cb71e3700cf…

MALICIOUS

PDF

80.2 KB Created: 2021-03-25 08:22:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: fd1ce5d773849e309627e2fc96ae4d8f SHA-1: d67d825578228f12504d6bedabe56a30733731f4 SHA-256: 8a584cb71e3700cf908aaef918865be1c997af78087e4dafec0442900d0fd32c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a tactic to drive traffic to potentially malicious or phishing websites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and heuristics point towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fokemale.ru/wix?keyword=alpha+epsilon+pi+ucf PDF link annotation
    • https://cdn.sqhk.co/rolaravez/iMOcqf6/sudokukingdom_com_play_free_sudoku_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496372/normal_600a7f4284eeb.pdfIn PDF document text
    • https://cdn.sqhk.co/waximanodif/ohahabA/79251781202.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/gTgdmjb/diadora_table_tennis_paddle_review.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvotalek/ljgihid/mitisi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462046/normal_5fc7adcfc0467.pdfIn PDF document text
    • https://cdn.sqhk.co/vagizabibo/iYUaiiF/stretches_for_flexibility_gymnastics.pdfIn PDF document text
    • https://cdn.sqhk.co/sezelijimofi/gahgjhG/mepugotebonimulidenamero.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417988/normal_6024c42703917.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479439/normal_60116e93edabd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb0dfc77-5b5f-4899-b7dc-cecceb9b6aeb/besigufifimajotib.pdfIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_db38e9049c1b458192e79e9abf0dd352.pdf?index=trueIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_6b656c47cde745b3b053c055e7b6c7ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e05217e3-1534-41c8-a3b2-1b45240b8bd2/94510385788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5d1c31a-a67e-4391-8da2-9215ab25f620/vedofejoroga.pdfIn PDF document text
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_e54f0db7aaa94e5fa887a517fe0eede7.pdf?index=trueIn PDF document text
    • https://73808e0e-d5df-4584-b63e-1552d949bc0c.filesusr.com/ugd/8d2ea6_30ae34a3a9854590a5b481943c2f59dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0619b409-5f6b-42c7-99f3-bfd5840b9ec6/77071149227.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85a563c3-0ba4-459c-ad50-ff884b9b41a4/69646979645.pdfIn PDF document text
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_38ee155f546e4d21a4cc01590348cf03.pdf?index=trueIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_1c85cf7666e5485f8f409517f41fd1b1.pdf?index=trueIn PDF document text
    • https://6c639bf1-704a-4500-b661-329758898742.filesusr.com/ugd/02d620_e7f54543c21040aabe53ad8ec63db80f.pdf?index=trueIn PDF document text
    • https://78a3f932-2eca-4366-91b9-d52a2f3c5f58.filesusr.com/ugd/a586f9_2efb6bc1fe364db699ee8d3f8ddd5df3.pdf?index=trueIn PDF document text
    • https://70745723-7f4a-4dc7-98be-95bdce43cd82.filesusr.com/ugd/67bae7_cd3761d8a7c648be9b742c96c7a81014.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 4996 bytes
SHA-256: 8f79a485c5de8afd5239fe4e86a40a10bba7f416b82c03b3b0181f9146573006
font_01_sfnt_off00010f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6D 10480 bytes
SHA-256: 6bbac9c5c861837d81c10228a2a1faddf0ebd0e54a6b2cec9a4fe4e141b02742

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