Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f2f0d0f5e1aadc…

MALICIOUS

PDF

75.8 KB Created: 2021-02-11 18:34:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 069bf90b10b85c3d3125984228a30c06 SHA-1: e9583739f7ce15a8a2982a212a1ed1ab2a34f0b8 SHA-256: a2f2f0d0f5e1aadcfe9bf61757ca34c2ad0ed0c88a9f09a907d9d1ee2248a499
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to other PDF files hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and numerous external URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=west+marlborough+township+pa PDF link annotation
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/9129224.pdfIn PDF document text
    • http://giveaway2020.info/kapamagixudafepuvebenupin7hdt.pdfIn PDF document text
    • http://brosbass.com/lizisuwilukapepizekarerib4blv7.pdfIn PDF document text
    • http://detonicro.website/the_civil_war_in_russia_was_betweeniw3qb.pdfIn PDF document text
    • https://cdn.sqhk.co/jekidase/3TNocIF/ticket_to_earth_2.pdfIn PDF document text
    • https://cdn.sqhk.co/lisupixiwe/4giGKBZ/fafireropado.pdfIn PDF document text
    • https://cdn.sqhk.co/zifuvifiweva/aAtgnx6/best_online_shopping_apps_usa.pdfIn PDF document text
    • https://tofoboloronu.weebly.com/uploads/1/3/1/6/131636632/e21f3013a0b.pdfIn PDF document text
    • http://jiwitoletazadag.iblogger.org/jonovomawodovodubejuvexe.pdfIn PDF document text
    • https://cdn.sqhk.co/japivuwali/7oBSidi/74366775404.pdfIn PDF document text
    • https://rexakutomas.weebly.com/uploads/1/3/0/7/130739652/3263731.pdfIn PDF document text
    • http://rebitet.22web.org/reromolojefuzunofujapixag.pdfIn PDF document text
    • https://motanaweda.weebly.com/uploads/1/3/4/3/134316912/dc0eb59.pdfIn PDF document text
    • http://price-list.moscow/navy_commendation_medal_template_word1aw7q.pdfIn PDF document text
    • https://wozizagozesa.weebly.com/uploads/1/3/4/8/134848764/dofotawubu_fipexuwarotesir_sevuwoliwedi_siwuxepogogot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lebasadalo.epizy.com/antutu_benchmark_top_android_tv_box.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_off0000e60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60A 5480 bytes
SHA-256: 432cc529cea19ab99f7911deecdd178df7e1e0486d48bef49999d92fcaf28b54
font_01_sfnt_off0000f895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF895 12368 bytes
SHA-256: ed3d0815e9b5dd3a36e5a460c6de5aa006330451ef8ab84f29a2cf407461ae4e

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