Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f805940c9ba0cb…

MALICIOUS

PDF

75.8 KB Created: 2021-01-15 00:09:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: fb685fd3594b3c8da88a74264fd183dc SHA-1: 75d109a019185a76855dee9354ea0f849320fb06 SHA-256: 80f805940c9ba0cb16eafd2554171dd4da3c2992590012aa5e86659e5fed4dfa
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious or phishing sites. The document body, though heavily obfuscated, contains references to URLs and metadata suggesting it's designed to redirect users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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/aws?utm_term=bittersoet+emir+ringtone PDF link annotation
    • https://site-1174627.mozfiles.com/files/1174627/5572210425.pdfIn PDF document text
    • https://bukodagunotul.weebly.com/uploads/1/3/4/0/134012399/fibiki-xifokosex-joxuvinuxe.pdfIn PDF document text
    • https://site-1177706.mozfiles.com/files/1177706/pinulis.pdfIn PDF document text
    • https://site-1206652.mozfiles.com/files/1206652/woodworking_classes_houston.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427504/normal_5f9bbc5bdcdb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476577/normal_5fb026380ada6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415309/normal_5ff09dc60ee61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460706/normal_5ff37bc62cb06.pdfIn PDF document text
    • https://site-1180311.mozfiles.com/files/1180311/27716152170.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379500/normal_5fe7e898eaf8b.pdfIn PDF document text
    • https://tokadasokavetim.weebly.com/uploads/1/3/4/6/134688198/ffd33dc51fb1d72.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/henghuili-files2/adobe_acrobat_pro_dc_scan_to.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/kaloregatawejekidipevif.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/what_is_editorial_writing_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/real_estate_investment_partnership_business_plan_template.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB07 4600 bytes
SHA-256: 96f0e2ae1014eb1082b00ef127473f472028def015ed3c64031ce2a8658b4f46
font_01_sfnt_off0000da89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA89 10680 bytes
SHA-256: cf9a6b1dd78d66ff0e359fd8513a6820654edacf44d378794f3d72e0135b45f2
font_02_sfnt_off0000fe14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE14 16264 bytes
SHA-256: 40b491b722b059d475da97e44050a5f0fdda0457e6535211b18309edac04bd7c
font_03_sfnt_off0001139c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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