Malicious PDF — malware analysis report

Static analysis result for SHA-256 b899a9d6fb201b81…

MALICIOUS

PDF

67.6 KB Created: 2021-03-18 02:52:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c42f5ea5da00837d7520de474b49924 SHA-1: 14179133890e49050a5383a2031bd97b26fc7f9b SHA-256: b899a9d6fb201b81a68265f9438f67c0558daf466256495c425bf54e487ae956
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains numerous external URLs, suggesting an attempt to manipulate search engine results or distribute malicious content. While no scripts were explicitly extracted, the PDF structure and extensive external links indicate a phishing or content distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/123?utm_term=figurative+language+worksheet+2+answers
    • http://xidasetetobuge.scienceontheweb.net/mujokupi.pdf
    • http://nuwevabufa.mypressonline.com/audio_amplifier_schematic.pdf
    • https://cdn.sqhk.co/fiduzosi/6jfjfLF/3443266671.pdf
    • https://cdn.sqhk.co/ginijetemepa/heIieQe/dollar_store_hours_memorial_day.pdf
    • https://static.s123-cdn-static.com/uploads/4370051/normal_5fcf1b47948c9.pdf
    • https://gejerirun.weebly.com/uploads/1/3/5/3/135312822/6972161.pdf
    • https://wojegapemepuwa.weebly.com/uploads/1/3/4/0/134096127/bf9a5ae.pdf
    • http://bupimobim.sportsontheweb.net/14484630836.pdf
    • https://cdn.sqhk.co/zakolemafemo/gcghhhB/kikukopoxejo.pdf
    • https://cdn.sqhk.co/tosilura/cjjVPAK/gujobekafete.pdf
    • http://rupaduwovuw.getenjoyment.net/jadukajuronagud.pdf
    • https://cdn.sqhk.co/sazalevimit/IiaHflS/chores_vocab_in_spanish.pdf
    • https://nibotilujegaw.weebly.com/uploads/1/3/1/3/131381886/2821330.pdf
    • https://cdn.sqhk.co/kigimole/bTjhcjc/dabirelakivapidofosedut.pdf
    • http://nadipewin.mywebcommunity.org/homelite_super_2_chainsaw_manual.pdf
    • https://cdn-cms.f-static.net/uploads/4457318/normal_604ee3e662970.pdf
    • https://cdn.sqhk.co/xivomojuf/jdjbECB/wikimed_wikipedia_medical_offline_for_windows.pdf
    • http://vanimerukaguto.scienceontheweb.net/bufidinopegurifadokezeje.pdf
    • https://dezijetide.weebly.com/uploads/1/3/4/8/134864221/6499578.pdf
    • https://cdn.sqhk.co/lokiwejawe/i0jeieF/the_diplomat_s_wife_movie.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pasifowon.atwebpages.com/89834746833.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd01.bin
bfc3886028555e212d1071c35fe5005fff0119895a351ec3d7f4afae97bf82f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD01 5252 bytes
font_01_sfnt_off0000def3.bin
f6df8dfa0ef512a00709a53bb371a89a30b7ab368027be47780f9ea46ae287ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 9816 bytes

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