Malicious PDF — malware analysis report

Static analysis result for SHA-256 02cb5f77a35740d7…

MALICIOUS

PDF

82.0 KB Created: 2021-04-10 22:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d543c9bc6269a92622b9ec8be1d654c7 SHA-1: ebdb9511d5482d6785a7780c0dc9bf7916ce26c8 SHA-256: 02cb5f77a35740d78d37f981d3211920a454d6e2eb4916125fc7bb523ba5a780
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of a lure to download further malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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.
  • 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://fokemale.ru/strik?utm_term=the+other+side+lyrics+sza+and+justin+timberlake PDF link annotation
    • http://strgb2.ru/sto_perigiali_lyrics_englishcbvii.pdfIn PDF document text
    • http://khareedforosh.com/vovodemuviwujefisf1agg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378157/normal_602142359a75c.pdfIn PDF document text
    • http://shop-profildoors.ru/how_do_you_forgive_and_forget_infidelityzuapb.pdfIn PDF document text
    • https://sozewewivekina.weebly.com/uploads/1/3/4/8/134874272/0eb6e.pdfIn PDF document text
    • https://xedawazusaxe.weebly.com/uploads/1/3/2/3/132303108/9041a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382962/normal_5ff0e601a2335.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489595/normal_604b8ca3cf219.pdfIn PDF document text
    • https://fezowekufeda.weebly.com/uploads/1/3/3/9/133999429/xipelinaxaje.pdfIn PDF document text
    • http://sbrf.link/675134403034db6k.pdfIn PDF document text
    • https://dozogifelezu.weebly.com/uploads/1/3/4/3/134313369/guriwujem_wubomogamida_vedadixi_zewuwexotop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375518/normal_60362381ee1f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409395/normal_5fdece2cabdbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444877/normal_606972135ed02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420222/normal_603fd70d3b3fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382781/normal_5ff996d022719.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_fca1706fe99942a4a2f86efbb31010cb.pdf?index=trueIn PDF document text
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_bd876d42d088462db4eb6530dcf3cc25.pdf?index=trueIn PDF document text
    • https://e05bdd54-7536-4db1-b7ed-110d7b12163e.filesusr.com/ugd/dd5a80_b1734bed39fa46959f0070ded1a37837.pdf?index=trueIn PDF document text
    • https://b0b8c8c5-0de0-49ea-8337-0a56b8a4e65f.filesusr.com/ugd/bf9dfc_5b132d7f600b47c7a51be1c26e8b47d1.pdf?index=trueIn PDF document text
    • https://fe4fa097-7109-4367-a76b-bc1f2b7936f3.filesusr.com/ugd/ef6f93_6f6ca7302b8643a38860d0a439dc7d4e.pdf?index=trueIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_c8d29c3c561b474dafeb9525fc00d78c.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 5560 bytes
SHA-256: 8cf038a684db82af57c8aa8f8d11711e22a89e643d586444e81eaae0c78a5997
font_01_sfnt_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 10688 bytes
SHA-256: b6a63d89b33296c77eedf57dd001b1170d4cea7157254d9b4e2005ecfde38c42
font_02_sfnt_off00012537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12537 16036 bytes
SHA-256: 2b0928db34fac5c89b0605429d14de9dd1587b94c3357c7ad3c21eff7068e068