Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aae51cfdfdbfa42…

MALICIOUS

PDF

76.1 KB Created: 2021-03-20 04:22:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 18b8ffd5f94e391af73773b04932af7a SHA-1: ed5a4e1d3111a13ac76ac9a849ea1011aa008d6b SHA-256: 6aae51cfdfdbfa42ebcdc21c9f5ded5e031ccfbe798b17922b87c45460c6b104
242 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to redirect users to external content, with one critical link pointing to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's part of a campaign to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 5

  • 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.
  • 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/award?keyword=alif+novel+episode+11+pdf+free+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4453890/normal_6050dcd73cebe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451556/normal_60062c40a21ea.pdfIn PDF document text
    • http://chambrehq.xyz/37052123960zjikr.pdfIn PDF document text
    • http://mangalvpodarok.ru/16529944362eis1x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446379/normal_6019bf12db2af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_6041f56cc0a5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485448/normal_600a29a5a4a0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451737/normal_5fe9ee14632eb.pdfIn PDF document text
    • http://2220202.ru/how_to_fix_my_canon_printer_b200_error6uru0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380857/normal_5fdab8e5204ec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sajezife/after_we_collided_movie_on_netflix_uk.pdfIn PDF document text
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_3acba7b6e838444491a29e8fa8968aea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03a31c38-7d9f-4329-a70c-de68967fd019/pojabojewimo.pdfIn PDF document text
    • https://8e8ef6ac-913c-489f-8395-c30730e7ba0a.filesusr.com/ugd/f39c52_f36f24cb26504b1fa173632b60cc33c5.pdf?index=trueIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_c2b46e5ec1434bf7be7820f8a7293d34.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/sanexed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee1b7922-f4ec-4b9b-a2b8-b3eaab1138d4/11854544096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f3193bd-1b05-4016-9522-2b0acba8ab22/ms_project_2016_free_download_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/tobonilodile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a7eed28-c664-4e1c-8f4f-e11b96cabb29/como_saber_qual__o_meu_orix_de_cabea.pdfIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_8c7ca29d0be1496fb25a9910470539de.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7571c28-14f2-4c93-a2b1-221bc74dd007/59938099063.pdfIn 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_off0000f078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF078 5228 bytes
SHA-256: c38b742f90b6e817208857250c755a66df1840e311008ee73440ec4d2810a7d6
font_01_sfnt_off00010270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10270 11520 bytes
SHA-256: 978007708f08dff9eba8dda8fd9f143fd7df2727bd056cafd5cd289364f39a0f

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