Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a114bd1914bd3c…

MALICIOUS

PDF

71.7 KB Created: 2021-01-12 17:33:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a2bf3cc2021e1d5b206ea6db9e2086ce SHA-1: e1a8e77071c53d4d5b1725e6468b36968257b2e1 SHA-256: 53a114bd1914bd3c09a612e9609e12426835dce8d739dcdcb573cd91004501a8
134 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. The document contains multiple external URIs, including one pointing to 'trafffi.ru' with a 'top doctor awards scam' parameter, suggesting a lure to a fraudulent website. The presence of numerous disposable hosting links further supports a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafffi.ru/123?utm_term=top+doctor+awards+scam PDF link annotation
    • https://cdn.sqhk.co/wumidimux/vTggghd/83420358393.pdfIn PDF document text
    • https://site-1166676.mozfiles.com/files/1166676/spade_card_meaning_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/joxipadij/ij7gdhg/lopibalivolefuzunilusu.pdfIn PDF document text
    • https://site-1175548.mozfiles.com/files/1175548/85639494351.pdfIn PDF document text
    • https://xujifedivo.weebly.com/uploads/1/3/4/8/134862591/723c411dd8cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393180/normal_5f95ca709c139.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413473/normal_5fd3c13e9530c.pdfIn PDF document text
    • https://site-1166068.mozfiles.com/files/1166068/gun_control_essay.pdfIn PDF document text
    • https://site-1179748.mozfiles.com/files/1179748/89339069310.pdfIn PDF document text
    • https://site-1174730.mozfiles.com/files/1174730/gerinosovilirazaveja.pdfIn PDF document text
    • https://rasofenetiko.weebly.com/uploads/1/3/4/8/134862321/zagil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7D 5228 bytes
SHA-256: ab0d2387a4a6c1205ffc9ced3b5f8a54183ea455d0c0e07361cfffbb918856dc
font_01_sfnt_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 10188 bytes
SHA-256: 1925359d45e25cab3c1c2f032191722238bffc80e58729f7bf5ab52b70e6fd9f

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