Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16351714486d429…

MALICIOUS

PDF

75.9 KB Created: 2021-02-11 22:00:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: fb2eba5b0b537c89add2d335a38be0f1 SHA-1: 03c5a405a24485ef035ed70250b2a24a80b0b161 SHA-256: f16351714486d429f5fe1135466c1a1fbbddc0b575457f5570ebac6272a92c4b
242 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links pointing to various domains, many of which appear to be disposable hosting. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious payloads. The ClamAV detection and ML classifier further support its malicious nature, flagging it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wb?keyword=probability%20and%20queueing%20theory%20ebook%20free In PDF document text
    • https://nefabilaj.weebly.com/uploads/1/3/1/4/131438225/wifobepuzudukug_madipaninema_mutapuj_sezisosarop.pdfIn PDF document text
    • https://roxobirunuj.weebly.com/uploads/1/3/4/0/134096027/tawuvinutudopebakos.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuviju/nhiibjf/drifting_bmw_3_car_drift_racing_mod_apk.pdfIn PDF document text
    • http://baykamif.space/weses3aerb.pdfIn PDF document text
    • https://pemolodubi.weebly.com/uploads/1/3/6/0/136052155/9998681.pdfIn PDF document text
    • https://cdn.sqhk.co/koditisalupe/8BX9dzX/word_connect_answers_level_1517.pdfIn PDF document text
    • http://umkatrade.ru/mizebaputodozab136m0.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/hggeSjg/pasuxofus.pdfIn PDF document text
    • https://pabotori.weebly.com/uploads/1/3/1/0/131070723/tugojasanabef.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/hsxhchd/sisters_of_battle_pre_orders.pdfIn PDF document text
    • https://galinigogazefu.weebly.com/uploads/1/3/2/6/132695851/fenuzanamuroguf.pdfIn PDF document text
    • https://leviwajij.weebly.com/uploads/1/3/1/6/131637177/jebome-goxapivalepo-zivofek-pelane.pdfIn PDF document text
    • https://zimegusak.weebly.com/uploads/1/3/4/6/134605775/suburiso_jatimupebebeba_nalediwekatof.pdfIn PDF document text
    • http://naturebiolog.fun/voperinarilu2lk03.pdfIn PDF document text
    • http://inter-kalinka.ru/318753577125pqfn.pdfIn PDF document text
    • https://namosupegu.weebly.com/uploads/1/3/4/3/134313644/gozavexilepix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vutakeba.epizy.com/fubup.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DB 5424 bytes
SHA-256: ff5ff0d746914e858ebd38d35ee1605c726af88402519d9959e2a5d4dd52bf24

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