Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba67ac742ac7528…

MALICIOUS

PDF

81.2 KB Created: 2021-05-10 20:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ab81346f8c297db503f91864acf904f6 SHA-1: 0e18f6f4a504034b28fc2cf079f7bc757a4601a1 SHA-256: aba67ac742ac752805fa0e16f0e1de3b7692ebfee83816a01a4e2b8254cd84d8
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links to various domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a tactic of redirecting users to potentially malicious content, possibly for credential harvesting or malware distribution.

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://nipisod.ru/strik?utm_term=bless+me+ultima+summary+chapter+4 PDF link annotation
    • http://varistop.site/is_crossfit_ok_for_beginnersl3rm8.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/gGJhick/11787939209.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403824/normal_60028ac72d625.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/gdorbif/osaa_football_2020_covid_19.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/jgmiijh/rikugopoxilu.pdfIn PDF document text
    • https://torolanomopefi.weebly.com/uploads/1/3/0/7/130739669/4b7f25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381101/normal_60642820aa445.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/UShahgg/38581482965.pdfIn PDF document text
    • https://natapoja.weebly.com/uploads/1/3/0/8/130813782/kagawa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384143/normal_600cde26cc630.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/hegigih/doxiset.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474456/normal_6023e37a67989.pdfIn PDF document text
    • https://cdn.sqhk.co/femelofep/cH8icgg/45172850869.pdfIn PDF document text
    • https://cdn.sqhk.co/zamepeja/itghghs/piano_keyboard_notes_for_kannada_songs.pdfIn PDF document text
    • http://liketime.fun/39547301104sdas6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379973/normal_60028f11a9a28.pdfIn PDF document text
    • https://wutowenejeboz.weebly.com/uploads/1/3/4/5/134599911/juvizidoboxaga-xirepupi-xegut-kanuxipoma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_fad0b1d4cf1a4ef3bc14f5e47770c135.pdf?index=trueIn PDF document text
    • https://1f53f175-067f-4140-b001-f66bebc9855b.filesusr.com/ugd/c711d8_7b144c08b06f431e97ae1b838d031614.pdf?index=trueIn PDF document text
    • https://a96990da-dd17-4b11-844c-aba2d588d1b6.filesusr.com/ugd/5e5e7b_b97bf98a09584fa1bc84fa8295a36f44.pdf?index=trueIn PDF document text
    • https://3c45aaf8-24f3-4cde-9773-cf44a0a970d3.filesusr.com/ugd/ae7d54_7e60ca5a23844811916e6d9f2c60f61d.pdf?index=trueIn 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_off0000ff9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9B 5412 bytes
SHA-256: 8db5ea841ca0db73c5c0c159c849a9e9981479152b77750e4af5e3ffaa3aa3c2
font_01_sfnt_off000111e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E1 10912 bytes
SHA-256: 84f074f73af34e8adb0b14a7a65dd5182af36e1eb74ac191c797d0ee4468c930