Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8008d3470610e0…

MALICIOUS

PDF

76.1 KB Created: 2021-02-13 13:58:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bc33c480b001829c1468110b42bda46e SHA-1: 6b45d7805aa5b2b9144626b7457ac39dafed9bfe SHA-256: fb8008d3470610e06611e1d68511c3fca16e9bd3d7cda70853a987b1e9dbbc1b
166 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as suspicious, including PDF_SUSPICIOUS_LINK_LURE and ML_NYX_PDF_MALICIOUS, with a critical ClamAV detection indicating it is a phishing trojan. The document contains numerous embedded URLs pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://seumenha.ru/123?utm_term=family+giving+tree+receipt PDF link annotation
    • http://managerprogram.live/pabirukobakonosinuloxou0ufi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419204/normal_5fe8d39aacf05.pdfIn PDF document text
    • http://pelistens.xyz/dosuzunato9ptdu.pdfIn PDF document text
    • https://cdn.sqhk.co/folamudoj/gfgifbf/ancient_empires_reloaded_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/nozujeraguje/idjigg7/59932227260.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414701/normal_5fe383a83bbf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408464/normal_600ecf2568be0.pdfIn PDF document text
    • http://idealicaitalia-oficial.site/vazujem05hv.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/6kjevGA/slice_of_veal_crossword_puzzle_clue.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487618/normal_602696f49cb22.pdfIn PDF document text
    • http://lolkek.xyz/dalamavatabusogirojitujx3y7d.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/giidctG/ponabinebopimupodugi.pdfIn PDF document text
    • https://cdn.sqhk.co/dugudumopup/hbRicgc/56663974175.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/picsart_for_mac_free.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_off0000ed77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 5192 bytes
SHA-256: 6470db2bda0dba21df5576919b7547f6c73a1b5c0813756b83c97a062e15c814
font_01_sfnt_off0000ff23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF23 10752 bytes
SHA-256: 719770f1f0676d38dba1a1b0929c3ee565770e78e28c51008ac43b9cb4aa3980

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