Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b2837828c59a92…

MALICIOUS

PDF

81.8 KB Created: 2021-03-31 00:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 14df65d0fb237e2f09bd108ad74fe11d SHA-1: 19b75954f7038580f93c97ade4aaddcda5b2b006 SHA-256: 91b2837828c59a926adfd399bd409da8a5f1bc79800cd8b168b82a8418bab2fc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://zajinet.ru/wix?keyword=spanish+repaso+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468255/normal_601a672252640.pdfIn PDF document text
    • http://shopyou.online/781716702352xyo6.pdfIn PDF document text
    • http://mekomob.getenjoyment.net/10440417607.pdfIn PDF document text
    • http://fitokaps.xyz/persuasive_reading_comprehension_passagest8ldu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379486/normal_601d5958d36b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502500/normal_6025288adddb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495039/normal_5fd28c690ef01.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/ajgfxrI/yellow_cab_in_houston_texas.pdfIn PDF document text
    • http://nosinoski.shop/cos_180_degreesxzytu.pdfIn PDF document text
    • http://teatr-art.com/4813102400utfya.pdfIn PDF document text
    • https://cdn.sqhk.co/jarebomu/aiaidif/fonedo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450632/normal_6052241ebfb01.pdfIn PDF document text
    • http://robertferrell.net/88740542651gqjx3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://relivoziz.atwebpages.com/fukujefunubu.pdfIn PDF document text
    • http://bidejepeko.onlinewebshop.net/social_impact_assessment.pdfIn PDF document text
    • http://kodadus.epizy.com/catalogo_bendix_zen.pdfIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_e9ef92c80d2b41e6ba5fef157eeaae38.pdf?index=trueIn PDF document text
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_11aa577a5c1d4b828594abfe037e6f70.pdf?index=trueIn PDF document text
    • http://xugiben.epizy.com/catholic_bible_for_android_phone.pdfIn PDF document text
    • http://wirowobizofox.epizy.com/how_to_use_a_barnett_jackal_crossbow.pdfIn PDF document text
    • https://c3bb11cb-ba02-405d-8462-2b4421b436e1.filesusr.com/ugd/4c7814_cbb102858bfe478bac19037511421859.pdf?index=trueIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_21cc2a7dfbf3480bb0180deea8d3c28c.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 5236 bytes
SHA-256: 8088eae08a93bc8b0c54732249a3e4d8a0de51daf31dd3ee4eb99c9f04c5975b
font_01_sfnt_off0000f80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 11964 bytes
SHA-256: 7e7e9e4afb684c2c7fca5e485ff4f878646544bd4a9dbb42043afc9a0012be27
font_02_sfnt_off0001203f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203F 17660 bytes
SHA-256: c398fc90be653f836d18d8912aa6ca696bc8779fd0b10b415164a47c58ea4b83

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