Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff391466ddc19588…

MALICIOUS

PDF

61.2 KB Created: 2021-06-03 14:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66acb8c2d60eb1e959e0ae5227085890 SHA-1: b0b9f0284dde320b8611d9afadcf55ebc9788448 SHA-256: ff391466ddc1958813bf6aac15a13143d21f208a422406323c2390f0569ccda9
184 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to potentially harmful websites. The presence of external URIs and a link farm heuristic points towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9545

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://smidgel.ru/pbw?utm_term=ge+monogram+refrigerator+ice+maker+stopped+working
    • https://nibawomufexax.weebly.com/uploads/1/3/4/3/134371272/594487.pdf
    • https://mamijaba.weebly.com/uploads/1/3/4/6/134634293/vudimukif_xadibixerawovuw_reruzuda_wogifewedinek.pdf
    • https://static.s123-cdn-static.com/uploads/4420934/normal_5fdd869166505.pdf
    • https://jilanuma.weebly.com/uploads/1/3/4/5/134522828/fusimig_moninujokit_silokopifoxudoj_letanavetawufe.pdf
    • https://surafevigenirax.weebly.com/uploads/1/3/4/6/134610600/6297676.pdf
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/2722120.pdf
    • https://lebabipiw.weebly.com/uploads/1/3/0/9/130968925/nuwudubuvipisut.pdf
    • https://lenudigibelap.weebly.com/uploads/1/3/7/4/137499492/kenoxavofu_lulokabemit.pdf
    • https://lebujuxavepe.weebly.com/uploads/1/3/4/6/134625260/3948680.pdf
    • https://gawaratanos.weebly.com/uploads/1/3/4/3/134339439/8ce49490885.pdf
    • https://siwuxamafovad.weebly.com/uploads/1/3/4/4/134489720/31050e83f29.pdf
    • https://cdn-cms.f-static.net/uploads/4464055/normal_6041396c4034b.pdf
    • https://zofekumu.weebly.com/uploads/1/3/4/7/134741387/7277917.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lopofemusun.pbworks.com/w/file/fetch/144527544/aptitude_test_online_free_with_answers_for_freshers.pdf
    • http://larabefejaji.pbworks.com/w/file/fetch/144500223/gaterirukijixuwufav.pdf
    • http://juwelite.pbworks.com/w/file/fetch/144542979/what_is_forensic_argument.pdf
    • http://nusuwoxub.pbworks.com/f/counting_quarters_nickels_dimes_and_pennies_worksheets.pdf
    • http://bovojigu.pbworks.com/w/file/fetch/144424566/mamalufatamazumuzano.pdf
    • http://zexowisam.pbworks.com/f/bivujefarepam.pdf
    • http://zepadatoju.pbworks.com/f/sozewanimelovagexizuzenem.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e21a.bin
56002ccd39e6a1642b0319b21db2db0a6043571a98fb2ef443fb62e339e42ed0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 5416 bytes

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