Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8224e52c4308045…

MALICIOUS

PDF

107.7 KB Created: 2021-04-03 21:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b00543f056828a3141d16c174f92ee49 SHA-1: 9102dc73f198fef08ccbb56f3335abc222a3928c SHA-256: b8224e52c43080455d486241b9cb0d82f6f33ba9d9b3985685a66127fe872af5
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains a link farm with numerous external PDF links, including one to 'fokemale.ru', suggesting an effort to redirect users to potentially harmful content. The document's structure and embedded links are consistent with SEO poisoning tactics to attract unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=auditing+assurance+services+and+ethics+in+australia+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375521/normal_5ff434bc74687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487618/normal_605d93a7941b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493876/normal_601fac3bf1746.pdfIn PDF document text
    • http://shoplus.info/stihl_she_71_electric_blower__vactu9cw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369327/normal_605c039d34c26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451929/normal_5fd7df358f5de.pdfIn PDF document text
    • http://mybiol.site/14299462286ya84d.pdfIn PDF document text
    • http://fc-aromat.ru/how_to_setup_symbol_barcode_scanner_li4278pq0bw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://969948a0-d7f7-4827-958e-a3856fee42d4.filesusr.com/ugd/9d40bc_e877cc1df9e04f9ba7441098fbcb40d3.pdf?index=trueIn PDF document text
    • https://7c3a386c-9197-44ff-a2a0-26a6be1b6260.filesusr.com/ugd/bba797_fbc8f1a85cb94a50b11c7a5d8460775e.pdf?index=trueIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_fbaafafda8ef4be7981760030fe53c62.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae4e7f5f-5ab5-43f7-8f0b-abfdc7b6f917/why_is_my_netflix_keep_saying_error.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fcf0be0-a183-4b5b-816e-07ba0bc1a099/motutujutizur.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/love_status_video_tinyjuke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3d1c02c-16ab-4dcb-8af0-28bd8ed2931d/what_to_put_on_a_navy_brag_sheet.pdfIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_7d492009cecc4a6181ed5b457bababf3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvarelo/identifying_limiting_adjectives_worksheets.pdfIn PDF document text
    • https://e79dab91-b8ca-4f03-a7cf-74564eaa1d8a.filesusr.com/ugd/009cd4_bf3de56620fb4b92898b265982c0b438.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbb98c57-c4ba-45e4-a5b9-e1d25aa76366/how_to_connect_steelseries_controller_to_xbox_one.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/54211342780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1252e446-bb68-4a21-bbc7-4b1ae9e67745/nobotininugusasetusilipu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001678a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1678A 5464 bytes
SHA-256: fafe4843f8088af8cdef5c96a22fdf6a9489eea818c6f23902537d6a37d72354
font_01_sfnt_off00017a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A27 11564 bytes
SHA-256: fc8f449c9577f3afbcc7dcc6a88b435aadc5f28018d7849dfb69e5ea46e71a8d