Malicious PDF — malware analysis report

Static analysis result for SHA-256 014f7bbf5965a3d0…

MALICIOUS

PDF

77.2 KB Created: 2021-04-06 15:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4db825d14978375619b747d97edb337e SHA-1: 43857c00b2fd948ead5fe7b2c545bf560a50861e SHA-256: 014f7bbf5965a3d0c5f25ff4e238f89b4ea96357bc01e066eaeb7d242fe42ce0
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While the document body is heavily obfuscated, the presence of external URIs and the overall structure point towards an attempt to redirect users to potentially malicious content, possibly for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/123?utm_term=video+editing+android+mobile+app PDF link annotation
    • https://penopamez.weebly.com/uploads/1/3/4/4/134496097/natinujipefudubitise.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491670/normal_5fc7d2f122308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416660/normal_604d2a62c5123.pdfIn PDF document text
    • https://tomasuniraruz.weebly.com/uploads/1/3/5/3/135392941/rumuxigamemar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409813/normal_60301474aed3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389358/normal_5fd1726a7f9ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417648/normal_601a7ac663c41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465123/normal_6031b1b64c7a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500447/normal_5fff3d7522b73.pdfIn PDF document text
    • https://mogasijukunuv.weebly.com/uploads/1/3/4/0/134042787/9581881.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473030/normal_5ff060e8bab9b.pdfIn PDF document text
    • http://kuliwajijet.22web.org/fraxinus_nigra_fact_sheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wiwedekepumepup.epizy.com/cancer_de_cervix_estadios.pdfIn PDF document text
    • http://dorofudi.epizy.com/cyberpower_cp1000pfclcd_review.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/airplane_crash_sound_effects_free.pdfIn PDF document text
    • http://timufumanusu.epizy.com/maurice_leblanc_arsene_lupin.pdfIn PDF document text
    • http://dojopugoput.epizy.com/activision_earnings_report_2019.pdfIn PDF document text
    • http://mosaxigegikoza.rf.gd/publication_design.pdfIn PDF document text
    • http://wuwepapose.epizy.com/crank_length_size_guide.pdfIn PDF document text
    • http://fafezevasuba.rf.gd/gijilujuzavopalefa.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/bhavan_vidyalaya_chandigarh_admission_form_class_11.pdfIn 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_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 5208 bytes
SHA-256: 8528e9c9c8ef7f910044f23b84881d5a7b6c940f3a5ffcbcb751096b62cad857
font_01_sfnt_off000100fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FE 10780 bytes
SHA-256: 3f41fb96ccaa405b11a61f806263e643b14045cfc2378f58f349a7e715659500

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