Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c0a062da5c83d4…

MALICIOUS

PDF

84.2 KB Created: 2021-06-08 07:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d4b5ea57aa7fc2ba88079b36496d8a2c SHA-1: 156400903da5c30dd36bafe467978bc703157e7e SHA-256: f5c0a062da5c83d4cb62d64291726d4492faccf4e95fc17435fbc8ec753d2c69
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs are likely used to redirect users to malicious sites or download further payloads. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nomylo.ru/pbw?utm_term=good+wolf+hybrid+names PDF link annotation
    • https://lutividagij.weebly.com/uploads/1/3/4/8/134896544/1ca529.pdfIn PDF document text
    • https://jejalonon.weebly.com/uploads/1/3/1/6/131636908/tesixasof.pdfIn PDF document text
    • https://boginajidu.weebly.com/uploads/1/3/4/6/134693166/pesalitagugagu.pdfIn PDF document text
    • https://fesimubigezati.weebly.com/uploads/1/3/4/5/134515628/bd6cee.pdfIn PDF document text
    • https://zefokivovemajo.weebly.com/uploads/1/3/0/8/130874141/8dbea8ba073.pdfIn PDF document text
    • https://jinunogafexaxim.weebly.com/uploads/1/3/4/8/134884933/6380466.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495385/normal_5fdab7cd84885.pdfIn PDF document text
    • https://tamoniwezetiro.weebly.com/uploads/1/3/5/9/135961995/tefudiliw_lixuxutezo_sifapa_muzelojed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425913/normal_60348ae0188b5.pdfIn PDF document text
    • https://ligotilup.weebly.com/uploads/1/3/4/3/134313371/7a16ccc02a.pdfIn PDF document text
    • https://bopewoxal.weebly.com/uploads/1/3/5/2/135296364/nososogegateli-tezubife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414501/normal_5fd11aa8c3475.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477400/normal_5feb0781a44bc.pdfIn PDF document text
    • https://jirozonuk.weebly.com/uploads/1/3/1/6/131606844/sowav.pdfIn PDF document text
    • https://mobuwutibuw.weebly.com/uploads/1/3/0/7/130739624/suzesip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473039/normal_6008ad579ddf2.pdfIn PDF document text
    • https://lenagalazipanom.weebly.com/uploads/1/3/5/3/135310064/pizewisetuxus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388629/normal_600ede41624a4.pdfIn PDF document text
    • https://bususofewibuju.weebly.com/uploads/1/3/5/3/135329568/c9fe0731af67db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422136/normal_60109b7dc9bca.pdfIn PDF document text
    • https://rizomoxus.weebly.com/uploads/1/3/4/5/134589692/dd74dcb6f2394.pdfIn PDF document text
    • https://sotezogurew.weebly.com/uploads/1/3/2/7/132740991/b0e03a7e.pdfIn PDF document text
    • https://kurajefofukagi.weebly.com/uploads/1/3/4/8/134895289/58b6dcc003a.pdfIn PDF document text
    • https://povominuvuz.weebly.com/uploads/1/3/5/9/135961678/5211326.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B06 5512 bytes
SHA-256: 8579d2bb629c79177920ef285c5b1991b09f7eb42ddb5a96fac237e0b097eb58
font_01_sfnt_off00011dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAC 10980 bytes
SHA-256: 7ba1236937dcd1a890da8305644e7bd8eeefb0227746dfc95342da92666b075d