Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f52a053eda3b652…

MALICIOUS

PDF

73.2 KB Created: 2021-02-03 11:45:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c7f9bdc171bd175abc903ca2e7a00ae3 SHA-1: 38c0de4c5ec8c54562bd6c2e8f4bf890c6d9cb75 SHA-256: 8f52a053eda3b65272ca0feb497f472cd57fb46001e606c432bc67c695ce3122
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 hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious link farm designed to redirect users to potentially harmful content.

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://maypoin.ru/123?utm_term=caber+toss+world+record PDF link annotation
    • https://cdn.sqhk.co/mujowofapubi/EhiMuja/80378703.pdfIn PDF document text
    • https://jibizixowaxen.weebly.com/uploads/1/3/5/2/135296653/43c2f856eeb1eee.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/vOk4Hhb/duxugugarodonor.pdfIn PDF document text
    • https://cdn.sqhk.co/nixafusoda/eShaDyK/jiwaxivobixafelop.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/hggg9hh/pigumosuvilimegin.pdfIn PDF document text
    • https://cdn.sqhk.co/runolisor/MTjdDYj/john_gba_lite_pour_iphone.pdfIn PDF document text
    • https://wawenefawopi.weebly.com/uploads/1/3/4/4/134494228/88b383.pdfIn PDF document text
    • https://cdn.sqhk.co/pulununese/gMjaAig/67902975727.pdfIn PDF document text
    • https://cdn.sqhk.co/tokititagiwe/fgh6gid/war_of_the_buttons_movie_review.pdfIn PDF document text
    • https://cdn.sqhk.co/daposofoxig/tgcichi/tubing_in_colorado.pdfIn PDF document text
    • https://jifofavara.weebly.com/uploads/1/3/4/6/134631997/5913e025bfe5.pdfIn PDF document text
    • http://xadejidigakezu.iblogger.org/48409678512.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/hisV9Hb/pitawunoforabewidivigi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rulenanevatetid.epizy.com/bye_bye_babu_song_free.pdfIn PDF document text
    • http://vudalulok.rf.gd/ashampoo_free_for_mac.pdfIn PDF document text
    • http://pirafabitibabik.rf.gd/fujisugigononigeb.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_off0000e04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04E 5068 bytes
SHA-256: 5fadd33773582cb6cdef03c4db3f4c0b6dde6135dba993611c112f9c4ff4e1e6
font_01_sfnt_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 11544 bytes
SHA-256: b8fd3a2a59cb836468fc1f443baf9809cb0658bc205d80755fa6a81b0a6d36d5

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