Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad33bc11b4e92be4…

MALICIOUS

PDF

79.5 KB Created: 2021-03-31 17:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 120e63d72344accc1356b76c43c06f08 SHA-1: 7ad1f8154d092d45f846375c21ab4adc4d1efe43 SHA-256: ad33bc11b4e92be41d030d6b0616d1da92ae1beaac2596b4271d0b1369ea299b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=sloan+flushmate+parts+near+me PDF link annotation
    • https://mebedepubini.weebly.com/uploads/1/3/0/8/130813558/xuxotaputugaju.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/mq6ijP7/wadofinesewotepo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474478/normal_5fc8aae8a9f6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411691/normal_6004699408eb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495849/normal_6023d78b8611b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409623/normal_6026081949b1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378848/normal_60314af64d657.pdfIn PDF document text
    • https://cdn.sqhk.co/dasadogiso/jrjhjb3/large_walking_robots_in_star_wars.pdfIn PDF document text
    • https://cdn.sqhk.co/kujufemom/jelnEGx/vip_slots_club_free_casino_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474722/normal_6002d9daaed1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457006/normal_60035dbea80e5.pdfIn PDF document text
    • http://pafugiwerokamez.iblogger.org/kezubupagerekoxuwed.pdfIn PDF document text
    • https://cdn.sqhk.co/segenoliz/7qehdq7/centurylink._net_email_not_working.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/2940d3b6d7a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422371/normal_5fcecd5a915dd.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/egjmhf2/88475851368.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gizimup.epizy.com/android_autofit_textview.pdfIn PDF document text
    • http://baxujaxifibew.rf.gd/medicinal_plants_and_their_uses_free_download.pdfIn PDF document text
    • http://webekilijonelew.epizy.com/17239538584.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_off0000fb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 5244 bytes
SHA-256: 3e43118bde781cdf357e4fd5168ee7b89e815e2063a7c0290232a7563c628825
font_01_sfnt_off00010d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D09 10600 bytes
SHA-256: fffe82b93490a197db3f8f7fa387a8c02aaa6a4123f860d41c7ff15fbf09ea55

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