Malicious PDF — malware analysis report

Static analysis result for SHA-256 83856ea4116db28a…

MALICIOUS

PDF

84.4 KB Created: 2021-03-23 20:03:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34bcc8b5579dcc288b4974e921a4de77 SHA-1: 78c9dae8aff15dc2356af39671759037736fa9fa SHA-256: 83856ea4116db28a3c45bd92b5132f35fd99c2462a63ca26379b3f3cdd6de8c3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing lures, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing and trojan activity. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=oregon+ducks+spread+offense+playbook+pdf
    • https://cdn.sqhk.co/zezinojox/d2hejik/pejalesuzanemojunaderoleb.pdf
    • http://kefudepoduwudi.sportsontheweb.net/coldplay_viva_la_vida_partitura_violino.pdf
    • https://cdn-cms.f-static.net/uploads/4481820/normal_60251babce404.pdf
    • https://cdn-cms.f-static.net/uploads/4482860/normal_6010a580cdf76.pdf
    • https://cdn.sqhk.co/tirabipati/VWuichf/dexubimegikegoxo.pdf
    • https://cdn-cms.f-static.net/uploads/4495037/normal_6010422e54f21.pdf
    • http://guzoseta.getenjoyment.net/fairy_tales_short_stories_in_english.pdf
    • https://static.s123-cdn-static.com/uploads/4366646/normal_5fdfa8d36a9b1.pdf
    • http://kuxogajow.iblogger.org/49522216178.pdf
    • https://cdn-cms.f-static.net/uploads/4407562/normal_601a2822b6fc0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_cb2eb41c9d72420f9140fd5ddcb95ef7.pdf?index=true
    • http://bozagasixafovo.atwebpages.com/vutusidetisewuxejerovez.pdf
    • http://gijufebevavudep.rf.gd/why_isnt_my_dishwasher_cleaning.pdf
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_a0a09bd728604846aa5aac12a00d82ec.pdf?index=true
    • 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_off0000fb13.bin
474fe1d6c57d15252894d4b0519077183e864948cf0d46b4e06379d109b0f6ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 5408 bytes
font_01_sfnt_off00010d8b.bin
2eb12d4db186d93fd7760304fa852fe6c4ac9a847ec494a321a0d7a4babd1f95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8B 11568 bytes
font_02_sfnt_off000134d8.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134D8 4324 bytes

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