Malicious PDF — malware analysis report

Static analysis result for SHA-256 570baa168fff554f…

MALICIOUS

PDF

74.0 KB Created: 2021-03-29 17:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8883c1fdf6370756db75621d7696a12 SHA-1: fcce9d1f60f2b8dec77043e4ff3956a2b3e69eb7 SHA-256: 570baa168fff554f9720dbc5960f7c345b3b952ab9762c96fc7b5b7be088c6e2
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, and a specific URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/wix?keyword=canaan+elementary+school+vt
    • https://cdn-cms.f-static.net/uploads/4393369/normal_60613088c110b.pdf
    • https://midagadin.weebly.com/uploads/1/3/1/3/131381693/887785.pdf
    • http://getegenufiduso.66ghz.com/82236373695.pdf
    • https://static.s123-cdn-static.com/uploads/4366964/normal_5fe1545146b5c.pdf
    • https://cdn-cms.f-static.net/uploads/4404287/normal_5fd835dc6bc2d.pdf
    • https://cdn-cms.f-static.net/uploads/4495244/normal_60431ab972fad.pdf
    • https://pejoguroboxifuj.weebly.com/uploads/1/3/1/6/131637830/navafujep.pdf
    • https://cdn-cms.f-static.net/uploads/4404500/normal_6048224d3801d.pdf
    • https://static.s123-cdn-static.com/uploads/4487431/normal_5fc5bd066c742.pdf
    • https://wepebajaka.weebly.com/uploads/1/3/4/5/134588919/fepufasoripet-tuwoxinaxut-sanogagezaromi-galizakari.pdf
    • https://garanokuwepo.weebly.com/uploads/1/3/0/8/130874617/1b973.pdf
    • https://cdn-cms.f-static.net/uploads/4444358/normal_601e0adfa968c.pdf
    • https://cdn-cms.f-static.net/uploads/4489056/normal_5fd11a11c8768.pdf
    • https://rovenefewapug.weebly.com/uploads/1/3/0/7/130775308/robewed-jevovosamijomi-jobol-rozijuvofaja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vavapekadoliti/android_update_candy_names.pdf
    • http://timavutiziv.epizy.com/maniac_mansion_nes.pdf
    • https://s3.amazonaws.com/subopukomanaw/classic_brick_games.pdf
    • http://gamovomubapo.rf.gd/pomoset.pdf
    • https://s3.amazonaws.com/votubukaxogilix/97015856774.pdf
    • https://s3.amazonaws.com/pidufozu/49593438854.pdf
    • https://s3.amazonaws.com/pigolo/2004_dodge_ram_1500_quad_cab_tire_size.pdf
    • http://magonusu.epizy.com/halloween_worksheets_for_2nd_grade.pdf
    • https://s3.amazonaws.com/savukojubusum/how_to_use_cpt_codes.pdf
    • https://s3.amazonaws.com/gitipelut/fekenuweva.pdf
    • https://s3.amazonaws.com/bizamesuwepe/dj_ambarish_songs.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_off0000e42b.bin
2b60edfd40f893ed097325a821f081b1a9f4d39f252baa1cab9cb59952103ffa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE42B 5108 bytes
font_01_sfnt_off0000f565.bin
c4cef0055d9859163566a58489f39498cbf3f97216a5009fc8cd71ec1afe67ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF565 10884 bytes

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