Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b93cf9f157bd54…

MALICIOUS

PDF

88.1 KB Created: 2021-03-11 23:24:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6e0eeb7b4c36aa6b590d27e34827ec0 SHA-1: 29f5686cdf3bee348ed7f1d9168deac6b9fc2ae7 SHA-256: 90b93cf9f157bd541e82e07ebdc548c972b65a494f030ea5e642c68654a391cd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm designed to attract users searching for software downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or downloader campaign.

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://mezovuduw.ru/wix?keyword=geometry+dash+full+version+free+download+apk+pc
    • https://posasuzu.weebly.com/uploads/1/3/2/7/132710669/40c8d.pdf
    • https://mixusabap.weebly.com/uploads/1/3/4/0/134096097/2471780.pdf
    • https://luwamagol.weebly.com/uploads/1/3/4/3/134375262/fodijaxo.pdf
    • https://gupamawuma.weebly.com/uploads/1/3/4/6/134602371/0860143e131.pdf
    • https://tezilejesitox.weebly.com/uploads/1/3/1/1/131163634/rulusebu.pdf
    • https://cdn.sqhk.co/nepelusir/318V74V/top_10_moto_racing_games_for_android.pdf
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/nefonapal.pdf
    • http://myfavoritesun.xyz/60783294578lzqq3.pdf
    • https://cdn.sqhk.co/zujumatatub/Yyij6Ob/home_design_3d_gold_cracked_apk.pdf
    • https://nojenekaxaxi.weebly.com/uploads/1/3/4/0/134017841/4459278.pdf
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/1919975.pdf
    • http://atelier-spb.com/likidosidelanemamebedobjwgxh.pdf
    • https://cdn.sqhk.co/kososojog/igjcFgd/idle_tanks_3d.pdf
    • https://mejuxubewa.weebly.com/uploads/1/3/4/0/134041058/nurakowarovav.pdf
    • https://cdn.sqhk.co/runolisor/hjQpWhb/dujal.pdf
    • https://cdn.sqhk.co/nujidegowupi/bbxXgdy/10568866474.pdf
    • https://nopuxexej.weebly.com/uploads/1/3/4/4/134498230/rigomufemuma.pdf
    • https://midumelu.weebly.com/uploads/1/3/4/3/134341446/lenevevu.pdf
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/b82d9010f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/petikamov/99985733192.pdf
    • https://s3.amazonaws.com/fulazelof/34494040633.pdf
    • https://s3.amazonaws.com/tawovojo/dusuxigoko.pdf
    • https://s3.amazonaws.com/webipejonavuv/does_warrior_fasting_work.pdf
    • https://s3.amazonaws.com/jusagi/talerudefoponeroful.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_off00010d26.bin
ffc4e76ce73cf977fcfe126b4b7ba5601d889220ac63a376a62191884d70f264
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D26 5624 bytes
font_01_sfnt_off00012046.bin
88996b0cfa7bc66aadc80e94c76997895303244d4525b9c1e63f7d470d97a63a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12046 10572 bytes
font_02_sfnt_off0001447a.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x1447A 4324 bytes