Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ccb2b9c88783c8…

MALICIOUS

PDF

87.7 KB Created: 2021-06-07 02:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ddab9477490d6aa460e8db005eba1c9 SHA-1: de85bfbbaad9a13081f76ae8459254fca6a93465 SHA-256: 34ccb2b9c88783c838802c6624b02d6344d5772ed00a23c91faa46610904e8c0
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', and the primary external URI points to a music sheet, likely a lure to disguise the malicious nature of the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ponafet.ru/123?utm_term=billie+eilish+bad+guy+music+sheet
    • https://jenajurowob.weebly.com/uploads/1/3/1/4/131408252/dajubuxixe-wegokodew-dakuj.pdf
    • https://static.s123-cdn-static.com/uploads/4384652/normal_5fc9d1cf7c2ff.pdf
    • https://buzubexod.weebly.com/uploads/1/3/4/0/134017192/2a1c84f8ace.pdf
    • https://lotunesu.weebly.com/uploads/1/3/0/9/130969364/04b80.pdf
    • https://reruwezoketa.weebly.com/uploads/1/3/4/5/134503250/xatuwore_bitadodu_dinibugaja.pdf
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/1224365.pdf
    • https://sonefuvik.weebly.com/uploads/1/3/4/3/134325549/a1ff30dacdbb48c.pdf
    • https://fusopozosasotex.weebly.com/uploads/1/3/4/4/134477759/fe4abdad23aef9.pdf
    • https://sufunisukexe.weebly.com/uploads/1/3/1/3/131381546/wodufufetef.pdf
    • https://cdn-cms.f-static.net/uploads/4426954/normal_60402fb490f36.pdf
    • https://tabuwesajusa.weebly.com/uploads/1/3/1/8/131856124/nanexamoxogadutage.pdf
    • https://gifoxulexup.weebly.com/uploads/1/3/4/8/134865115/7970719.pdf
    • https://naguruzitu.weebly.com/uploads/1/3/4/3/134369267/70f5cb21ae6feb8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://gezebal.pbworks.com/f/31276534477.pdf
    • http://lekuzax.pbworks.com/w/file/fetch/144680274/how_do_i_get_medicare_reimbursement_for_shoes.pdf
    • http://barotidi.pbworks.com/f/97402007802.pdf
    • http://gazumadu.pbworks.com/f/77047564304.pdf
    • http://saxonax.pbworks.com/w/file/fetch/144681678/how_to_download_gb_instagram_in_android.pdf
    • http://fevuxowina.pbworks.com/w/file/fetch/144604944/wexixosekezigi.pdf
    • http://sokulus.pbworks.com/f/87651276079.pdf
    • http://jujupaw.pbworks.com/w/file/fetch/144616140/82142239862.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f254.bin
76d1710f06028c4082c39c769e04f5b78a664059649ac52802d025521afdabcd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 5212 bytes
font_01_sfnt_off00010417.bin
96bc1254da44a3521849dbede167273259b911e16fd2720fa93cbe41645c0da9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 12296 bytes
font_02_sfnt_off00012df4.bin
184efd0e138a9418359f6897f9ac56b5cd93cafbd57abf30711ac2aee7e18832
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF4 16120 bytes
font_03_sfnt_off000142dc.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x142DC 4324 bytes