Malicious PDF — malware analysis report

Static analysis result for SHA-256 a639757f71237e2b…

MALICIOUS

PDF

89.9 KB Created: 2021-04-05 06:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1e67e19552baf715d1ed7d576dca09b2 SHA-1: 4ba46d0a77cc46fa1196b28f0da524dc8d2e2324 SHA-256: a639757f71237e2b64a24035f6f8cf4f27d5ff82729025a45f1710a257cd9ee0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting or link farms, indicating a phishing or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://golowaki.ru/strik?utm_term=fundamentals+of+physics+halliday+11th+edition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496380/normal_600b7a457e49e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391642/normal_605f92500a12f.pdfIn PDF document text
    • http://mojadejazisapa.sportsontheweb.net/4460718586.pdfIn PDF document text
    • http://guwejusu.22web.org/english_comprehension_worksheets_for_grade_4_cbse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404503/normal_6025995625844.pdfIn PDF document text
    • http://giboxibefelas.22web.org/fedurozijamapirim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379855/normal_6005a15f7ec6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466366/normal_6040435c10855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388612/normal_6058d09bdc7c9.pdfIn PDF document text
    • http://xarapover.mygamesonline.org/spielplan_fuball_bundesliga_2020_19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426944/normal_603a5dcb9e05f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490757/normal_600a735fe33f3.pdfIn PDF document text
    • http://zenododuro.iblogger.org/malipevogirubewajizor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374181/normal_6042445c8ddaa.pdfIn PDF document text
    • http://zexitekaxob.mypressonline.com/vupekawinibowon.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
    • http://mosemoxibug.rf.gd/27092227291.pdfIn PDF document text
    • http://jilutuve.rf.gd/93754134038.pdfIn PDF document text
    • http://kexofiz.epizy.com/how_to_design_foundation_for_steel_column.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/what_does_fyp_do_in_linux.pdfIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_82d9db96737f46349154289f0f9b7138.pdf?index=trueIn PDF document text
    • http://vuvulew.rf.gd/mulotujulojuzoferetodum.pdfIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_1ad88af98c8f4e79979464597a898c4d.pdf?index=trueIn PDF document text
    • http://kozifina.epizy.com/49060976616.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/94487237386.pdfIn PDF document text
    • http://butadiviwev.rf.gd/net_force_worksheet_answers_key.pdfIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_d6b2415c1bbd4883bab69b9ff1ca1035.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AF 5292 bytes
SHA-256: f88665c7706319a12669d6522f1c7de7ee97f85cd425918189e6f172f7f65a1a
font_01_sfnt_off00011b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B97 18088 bytes
SHA-256: 76aabc0a5b42517a4566430351194618d6eef794e177998ae5f80aaf870edc22
font_02_sfnt_off000149e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E1 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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