Malicious PDF — malware analysis report

Static analysis result for SHA-256 f827d0c2b963be9e…

MALICIOUS

PDF

77.1 KB Created: 2021-06-04 04:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d436367ee694b8b8f3e2ad51d36b8df3 SHA-1: 0b2f1ab8df8a08f62b75393967d074fdc4a76800 SHA-256: f827d0c2b963be9eaf020eb91303c669fc117194ca81ecaaf5a7d9a9266f7363
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs with numeric slugs, indicating a potential 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 links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://posapana.weebly.com/uploads/1/3/1/4/131454172/3135895.pdf
    • https://vaxinukosiju.weebly.com/uploads/1/3/4/6/134625250/kezepimobiw.pdf
    • https://kasugokadudibuk.weebly.com/uploads/1/3/4/7/134740653/2108821.pdf
    • https://xumusozopojuvuj.weebly.com/uploads/1/3/1/3/131398507/sifek.pdf
    • https://cdn-cms.f-static.net/uploads/4448542/normal_5fe81d34af2fe.pdf
    • https://cdn-cms.f-static.net/uploads/4370068/normal_600c75e2d56a4.pdf
    • https://finudumibinad.weebly.com/uploads/1/3/4/3/134344164/3231948.pdf
    • https://xiruzukigipimog.weebly.com/uploads/1/3/4/8/134865515/filusetugase.pdf
    • https://fofopozisiwel.weebly.com/uploads/1/3/2/6/132696178/2954343.pdf
    • https://static.s123-cdn-static.com/uploads/4499005/normal_5fffc594caf25.pdf
    • https://cdn-cms.f-static.net/uploads/4451950/normal_605d00aeab852.pdf
    • https://sikevitexin.weebly.com/uploads/1/3/5/3/135301450/4cdf9489734b9e5.pdf
    • https://sufusazowuk.weebly.com/uploads/1/3/4/3/134311692/laputit.pdf
    • https://varavedonenen.weebly.com/uploads/1/3/4/3/134316352/8733458.pdf
    • https://valiveve.weebly.com/uploads/1/3/4/7/134730204/3517217.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://feedproxy.google.com/~r/wb/ENAH/~3/B9wesDdUo4k/wb?keyword=how%20does%20a%20rudder%20work%20on%20an%20airplane
    • https://uploads.strikinglycdn.com/files/aacc0e74-ea0b-47a1-8add-709ff2cb911a/adobe_premiere_free_transitions.pdf
    • http://gopidam.pbworks.com/f/poemas_para_despedida_de_la_escuela_primaria.pdf
    • https://uploads.strikinglycdn.com/files/465b6461-96ca-4ad4-be65-706fe12de56c/how_to_calculate_calories_required_to_lose_weight.pdf
    • http://liguduper.pbworks.com/w/file/fetch/144575571/17113945676.pdf
    • http://zupelapowi.pbworks.com/w/file/fetch/144499164/nyimbo_za_bongo_fleva_za_zamani.pdf
    • https://uploads.strikinglycdn.com/files/f0d86a84-d7ff-49bd-97f4-c709ea00b6f3/76409018739.pdf
    • http://wojipag.pbworks.com/f/dokufiwasevobizuziwukimeb.pdf
    • http://degagogo.pbworks.com/f/557591688.pdf
    • https://uploads.strikinglycdn.com/files/a1f26c5a-5b96-4967-80d6-b2bfca2d9846/20279261635.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3bf.bin
cf8f0b616bdee38473701270e897955f5d8251d9aec3ba08404094a36ec5c1e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BF 4872 bytes
font_01_sfnt_off0000f461.bin
dd695cc9524520af3d7e19ab6e1a3717099aa30785cfe6d2146ab0ea87cb06d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF461 10588 bytes
font_02_sfnt_off00011887.bin
8405bb6ca9a6fb718a2e910e1cdde4d74ac2122cab0061dc5f772322db9c7ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11887 4324 bytes

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