Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7ab3557c736ddd…

MALICIOUS

PDF

80.5 KB Created: 2021-04-11 03:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1ccf2f212bddc4ced0f838723bb67517 SHA-1: bee09d7803c4f200c6c88548d7daa3f3b4052a0e SHA-256: 9f7ab3557c736ddd6cc72f0ff8c424f694858f450fa6a79ce722e27cb51025d3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://dafemum.ru/strik?utm_term=the+choice+book+summary+edith+eger PDF link annotation
    • http://dufazesiz.mywebcommunity.org/kirchhoff_s_law_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/pujapipiwat/qxieFhf/79946708429.pdfIn PDF document text
    • http://submonster.xyz/seguxepinodusesibuse7n9p9.pdfIn PDF document text
    • http://marketes.pro/8553805605704cpf.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/Zjalp3u/miwubolafel.pdfIn PDF document text
    • http://nitiwomifigurod.mygamesonline.org/cracker_barrel_catering.pdfIn PDF document text
    • https://cdn.sqhk.co/rudugebakivo/hfStieh/liwubowurivopigiwijegigi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477913/normal_601023d425258.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470223/normal_5fc89a1e3eded.pdfIn PDF document text
    • https://cdn.sqhk.co/zoboxoba/48hchaO/fafumaxuvibotukavulibav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453890/normal_5fda7d9e4a5b8.pdfIn PDF document text
    • http://fufirewavit.getenjoyment.net/astm_e8_tensile.pdfIn PDF document text
    • http://umdtheatre.ru/lujekuzizagimigupkyoo.pdfIn PDF document text
    • http://rmk4sale.xyz/45063022912ctwit.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/bbheF8r/froggy_jump_song.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://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_d5d34f1c88b540b0b41ac2d0b6bb6d21.pdf?index=trueIn PDF document text
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_10a345a1f1a54fb08345c7e69bcfe6ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/324ef906-0ced-41e9-a281-c165d70c676e/91925665531.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f617c6e6-8ed5-48b5-998a-99b04d300319/bissell_turboclean_powerbrush_pet_carpet_cleaner_2987_vs_2085.pdfIn PDF document text
    • http://mawidinivetobi.myartsonline.com/edit_text_android.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 5352 bytes
SHA-256: b986e576e58d8b704ed150e1fb1de3c6ca744741882971bfdbd6c99bfc5231ed
font_01_sfnt_off000102cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 10476 bytes
SHA-256: 050afc17dfe831cd9a3a0477d44040ed4556bd188edd463eda6d34b50a5f17a5
font_02_sfnt_off000126aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AA 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34