Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1f137aac7960fe…

MALICIOUS

PDF

71.2 KB Created: 2021-03-13 22:00:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: bb30818894425ae597b33ce11f4bcb66 SHA-1: 5b6c727ce58d5f5e325101ffb82afa55375e4098 SHA-256: da1f137aac7960fe197ebc79889dedd19050dc190bd6264e2d8a7e48398a297c
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, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification yielded a high probability of maliciousness. The embedded URLs are the primary indicators of compromise, likely leading to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://golowaki.ru/award?keyword=aptis+english+test+sample+pdf PDF link annotation
    • http://forpost-electrica.ru/memisawigojoll8yms.pdfIn PDF document text
    • http://winclean-shop.space/lasko_box_fan_replacement_bladesch2us.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/icGhZig/zombie_war_4_pc.pdfIn PDF document text
    • http://roskycnmx.com/bacterial_protein_synthesiss7zdd.pdfIn PDF document text
    • https://cdn.sqhk.co/xajevedu/jbidrha/sudil.pdfIn PDF document text
    • http://rodsfish.club/norton_anthology_of_short_fiction6cscf.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/gXYNshh/97272756701.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/john_tukey_exploratory_data_analysisnak1n.pdfIn PDF document text
    • https://cdn.sqhk.co/komagiju/mpycChb/tucson_transmission_auto_repair_tucson_az.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxonavi/ghTHjjh/wojipefes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf09ec9d-efe9-408b-ba63-4f0f1473e77d/92182108608.pdfIn PDF document text
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_040dbceed8564997a14370fa66aafda8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d21ef07-55bf-4241-a83a-41f94ef0e411/weber_grill_lowest_price.pdfIn PDF document text
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_89c3ba72f5594307a3287680113dcfb1.pdf?index=trueIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_0a3d3f60529f484693e1b101c5df2212.pdf?index=trueIn PDF document text
    • https://52468903-0e2d-47c5-babb-61e1d305d291.filesusr.com/ugd/32777b_27a651984be74fd98bb28859df237ed2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/ipg_carmaker_software_free.pdfIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_10f87ff4449447b281a567848f45f842.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/87e056d0-cc39-48ec-b41a-313f2ea28fa0/blood_bowl_skills_nurgle_rot.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/67245681782.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/1452572598.pdfIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_acfc43564c4c475aba62edc2b779c4f0.pdf?index=trueIn PDF document text
    • https://143c7e3e-1a56-4739-9c24-5aac26b0263b.filesusr.com/ugd/28d7c1_4f81a5db38a44b83af766b1c8fafc68b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e12e0944-6c68-4a0a-8c4e-7e0e8778bed1/machine_learning_framework_ruby.pdfIn PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_004bae1221da4ce6a17cb0b688a37e2f.pdf?index=trueIn 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_off0000da9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9E 5348 bytes
SHA-256: e837e39947d719840cd3e5f882bfe8a215888cc477e6ab1b1cdca86faf26c5ff
font_01_sfnt_off0000eca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA9 10100 bytes
SHA-256: e16b3c84c90657eef7532a60e21984df3535936ad0d613c25507c57dce7aa114

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