Malicious PDF — malware analysis report

Static analysis result for SHA-256 248ca8cbf3ef28ea…

MALICIOUS

PDF

83.3 KB Created: 2021-05-27 20:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd24a496894ea76139336d593e348694 SHA-1: 5608b5267b3294e33c3855a03800851b2f8ee38d SHA-256: 248ca8cbf3ef28ea458b4d8d1608cef194d38f049486ff30e6eea65bc1ca25ee
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it is part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to 'psoas injury'. The primary malicious URL identified is fokemale.ru, which is likely used to host or redirect to further malicious content. The presence of external links and the ML classifier's high confidence score support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/strik?utm_term=how+to+recover+from+psoas+injury
    • https://welarozukakiwa.weebly.com/uploads/1/3/4/4/134497755/resodaj.pdf
    • https://cdn-cms.f-static.net/uploads/4452395/normal_605bb0d91b909.pdf
    • https://static.s123-cdn-static.com/uploads/4464862/normal_5ffdc41f1d512.pdf
    • https://wubobuxidozexe.weebly.com/uploads/1/3/4/3/134322977/2986441.pdf
    • https://static.s123-cdn-static.com/uploads/4379987/normal_5fdde55abaecb.pdf
    • https://cdn-cms.f-static.net/uploads/4425224/normal_603a42f8b7be8.pdf
    • https://pisolani.weebly.com/uploads/1/3/4/6/134668870/30b029c9069.pdf
    • https://cdn-cms.f-static.net/uploads/4384642/normal_5fd7d60c4d040.pdf
    • https://cdn-cms.f-static.net/uploads/4478928/normal_6054fa2def9ff.pdf
    • https://sasujenag.weebly.com/uploads/1/3/5/3/135337218/2004659.pdf
    • https://kojozoxilasa.weebly.com/uploads/1/3/5/3/135302893/6856587.pdf
    • https://kitopelok.weebly.com/uploads/1/3/4/3/134355781/bukevosu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4235540e-e411-4793-856f-0a80ed6dd35b/10296944698.pdf
    • https://uploads.strikinglycdn.com/files/d03e7e9c-ef74-42cb-b4d8-b677217af8b5/ar_15_keymod_handguard_accessories.pdf
    • https://uploads.strikinglycdn.com/files/444471de-fa26-470c-87e2-7fbafc4e9488/fekudaxu.pdf
    • https://uploads.strikinglycdn.com/files/4a07c35d-5d26-4d67-a459-59acff4969dd/nupapeniganoxigegov.pdf
    • https://uploads.strikinglycdn.com/files/23e6e548-29b9-40d6-b1c1-d4a0d697b8fb/vuzubedogodadujoku.pdf
    • https://uploads.strikinglycdn.com/files/29325901-31a9-4a6e-b872-927994ba262e/is_it_illegal_to_have_fake_money.pdf
    • https://uploads.strikinglycdn.com/files/81c2acdd-b61f-450e-89e8-fedc0223222b/dokobibifemolatujazob.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0dd.bin
01832bf7e4865c2dc6000b18f3eda1a6059c0c679955fbded75bae5703a23e7d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 5420 bytes
font_01_sfnt_off00010355.bin
9145ecce575d82765f34aa772bdf2d5de9b695c7515170c386806fdb5501225d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10355 11400 bytes
font_02_sfnt_off00012a6a.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6A 16204 bytes