Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0d48e8e803a403…

MALICIOUS

PDF

79.7 KB Created: 2021-03-12 09:31:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a9fb1265e3bd1f149526b0a4a99fbfc SHA-1: d1e8a606f51e8917ebbee7d244d859c0e353e75c SHA-256: 7f0d48e8e803a403a7c82abb33e91ab0e77132bc1985578e410d96aa002ae8e1
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The presence of numerous external links, particularly those pointing to PDF files, suggests a link farm or SEO manipulation tactic. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://vilenefex.ru/award?keyword=types+of+blotting+techniques+pdf
    • http://shmelev.pro/fazutoxuzegojko3bs.pdf
    • https://static.s123-cdn-static.com/uploads/4485587/normal_5fce9b0c4d9d6.pdf
    • http://tophomework.space/mapa_euroasitico_con_nombresfgsni.pdf
    • https://static.s123-cdn-static.com/uploads/4470016/normal_5ff9f0669c45a.pdf
    • http://catsism.com/penuxuliwakevigujizoeqc4q.pdf
    • https://static.s123-cdn-static.com/uploads/4484383/normal_5ff854f6b24b6.pdf
    • https://cdn-cms.f-static.net/uploads/4446651/normal_60166292c5514.pdf
    • http://laxana.ru/panic_attacks_workbook_carbonelloso16.pdf
    • https://cdn-cms.f-static.net/uploads/4379237/normal_5fd75bd8bbdef.pdf
    • http://topvideo.design/79065992808bpoey.pdf
    • https://cdn.sqhk.co/silakozafi/hCidjaD/kirofoxif.pdf
    • https://cdn.sqhk.co/mumaxeje/jAjmhgj/avc_converter_free_full_version.pdf
    • https://kesevure.weebly.com/uploads/1/3/4/4/134497963/nopoxijino.pdf
    • https://static.s123-cdn-static.com/uploads/4402963/normal_5ff9e4af2e851.pdf
    • https://cdn.sqhk.co/vapatibu/ydkggf4/12434484631.pdf
    • https://cdn-cms.f-static.net/uploads/4481168/normal_604a40e1205f8.pdf
    • https://katibaluzopoxu.weebly.com/uploads/1/3/0/7/130738884/ba05e.pdf
    • https://cdn.sqhk.co/gujowaxexag/thepha4/space_engineers_dedicated_server_not_responding.pdf
    • https://cdn-cms.f-static.net/uploads/4407807/normal_602a196eb866f.pdf
    • https://static.s123-cdn-static.com/uploads/4475863/normal_5ffe8582f2be4.pdf
    • https://cdn.sqhk.co/naveropifo/Njghci8/us_aircraft_carriers_2nd_world_war.pdf
    • https://cdn-cms.f-static.net/uploads/4426075/normal_601d125ec563b.pdf
    • https://static.s123-cdn-static.com/uploads/4406202/normal_5fed9d98b97aa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc69.bin
e0bd9992bea73b38a3cda0199bc92422afdeac53a0c989d59707a0f2af0c0701		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC69 5428 bytes
font_01_sfnt_off00010edc.bin
c6c4ca4593eff5f53c95083560a512a0be684873613bb5d88ef29347ef0b9523		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDC 10064 bytes

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