Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f83690e21cb011…

MALICIOUS

PDF

73.2 KB Created: 2021-06-04 07:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 452790dbb85d61136aaca63170f6cc4c SHA-1: 9a079bd077f2b846bd369479f6ddf419ebc7f179 SHA-256: a6f83690e21cb011fc47da6723f989231ee1a62e11b9ec3297d01ad5c77f41a2
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://medvor.ru/pbw?utm_term=how+to+check+other+number+call+history+without+otp PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412896/normal_603fcb4e439dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413110/normal_5fc6b9c23dcab.pdfIn PDF document text
    • https://tolubezilonis.weebly.com/uploads/1/3/5/3/135348590/1119809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407983/normal_6028e79227e44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485926/normal_603ac48dd17bf.pdfIn PDF document text
    • https://tiwapopo.weebly.com/uploads/1/3/0/7/130739059/gigapepelogubajome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476756/normal_6040f20fda061.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404983/normal_60378fe22ee6e.pdfIn PDF document text
    • https://jederatikepu.weebly.com/uploads/1/3/4/3/134370591/posibe-tured-keleme.pdfIn PDF document text
    • https://silavetej.weebly.com/uploads/1/3/5/3/135314504/kakula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450896/normal_601d7029a7fca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuvebag.pbworks.com/w/file/fetch/144427998/40457001610.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144582657/tevaputalenosujevotagog.pdfIn PDF document text
    • http://lomexalipele.pbworks.com/w/file/fetch/144506814/phoenix_rc_6_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9e9dd43-1de8-49b2-8a33-8d4e247143d4/wahl_trimmer_spare_parts_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21454389-3e09-4c3a-b74b-767eb5370368/how_to_rekey_a_gatehouse_deadbolt_lock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/398f5236-01c2-4997-8545-9d218137fcbf/moguferuwe.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/f/pevutexipepopofapogada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2fbfb48-b7a4-4b20-aee0-0c51abd1d0a8/100_most_common_phrasal_verbs_list_with_meaning_and_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8c60f89-440b-4726-b91f-1de6cbbaacd3/bluebook_citation_generator_apa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c92142e4-74ab-4626-8768-934b32c6a049/problemas_en_paraiso_chapter_2_summary_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6de87eba-3ac3-4a2e-876e-e8ccbe58e609/59057269841.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_off0000e12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12B 5532 bytes
SHA-256: bdf8a1aa63f2a2758d9861bac400be30ab9a76f5983a3bf0ec5e87ecf9aae2bf
font_01_sfnt_off0000f3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E1 10364 bytes
SHA-256: 20741240ade470d643d7f5ea70bbfd26af9c8ceb50aa406927f45eac8eef7e91

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