Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e28a8615f72bcd6…

MALICIOUS

PDF

70.5 KB Created: 2021-05-29 10:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c2abd522bd5b6a39f9a52da586d956b0 SHA-1: c88053e32fd97d7749a2b6cb350c0bf72fff5ece SHA-256: 3e28a8615f72bcd604abf18a40241088c6786833f0c43df7689281e1425d7690
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to redirectors designed for SEO and phishing. The primary URL identified, https://golowaki.ru/strik?utm_term=myers+and+twenge+social+psychology+12th+edition+pdf, is used as a lure for a free download. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a link farm or phishing campaign.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://golowaki.ru/strik?utm_term=myers+and+twenge+social+psychology+12th+edition+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375076/normal_60067456d1360.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417140/normal_5ffc38403cd2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492915/normal_605711aca7bcb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411246/normal_5fced0b662cb9.pdfIn PDF document text
    • https://gevofiku.weebly.com/uploads/1/3/4/7/134759045/6627539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417214/normal_6033c9501328a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486356/normal_601198aac7aaf.pdfIn PDF document text
    • https://bumaxaxup.weebly.com/uploads/1/3/4/2/134235918/webaxutozexax.pdfIn PDF document text
    • https://deketonozalupu.weebly.com/uploads/1/3/3/9/133997688/dejawose.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482230/normal_5fcc9d518d9bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450034/normal_600f305e3473c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371240/normal_600ff1df9df1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486745/normal_6001ae4aaca0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_60663a26757d0.pdfIn PDF document text
    • https://jitebosezukazup.weebly.com/uploads/1/3/4/1/134131420/radefavub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_60149c8ce5544.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472204/normal_601bdd58e8718.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458390/normal_606423dfa9b60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423195/normal_600614f02e147.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/e6362280-ec96-4585-bdc8-f3bde71c80f9/73172009823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/573c9bd5-f07e-4137-8aad-f5e2ab952d82/19862279338.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_off0000d5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C2 5800 bytes
SHA-256: ec5c8d3d734cd58fa913c53d2197670473f57059e671e17d647946fd325c5214
font_01_sfnt_off0000e9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AC 10160 bytes
SHA-256: 8f11503ec8700e527e514e9195b3906d59c6f7254d4cae3f3aaf69bf92494114