Malicious PDF — malware analysis report

Static analysis result for SHA-256 985e49f21cb0a5cf…

MALICIOUS

PDF

80.4 KB Created: 2021-02-16 07:57:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8805575a765f5fe39f519e3e6f2270a6 SHA-1: 2bbc02544576cb6a9c80ec4f2f67ce3b75461ec7 SHA-256: 985e49f21cb0a5cfffd818fcd816723edd63eeb808fb82c240b6463db032d4d6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of SEO link farming or phishing distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

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://bologen.ru/strik?utm_term=fifty+shades+of+freed+hindi+dubbed+movie+download+filmyzilla PDF link annotation
    • https://ropupapufodugut.weebly.com/uploads/1/3/4/6/134650221/ddfae46e0ae5.pdfIn PDF document text
    • https://mewupevubuk.weebly.com/uploads/1/3/5/3/135387541/9112839.pdfIn PDF document text
    • https://bosamekuxukis.weebly.com/uploads/1/3/4/6/134672370/fivovu_mugod_pasefogu_dofedal.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/eRgevwd/cardboard_cutouts_baseball_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/bowevuva/gjKRggh/como_se_dice_reposteria_fina_en_ingles.pdfIn PDF document text
    • https://ziwagunu.weebly.com/uploads/1/3/4/8/134883986/5438c06285535.pdfIn PDF document text
    • https://jitikefovanoz.weebly.com/uploads/1/3/3/9/133997517/domamopatitid.pdfIn PDF document text
    • https://fisujokogawubi.weebly.com/uploads/1/3/2/7/132711991/1623130.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://patenat.epizy.com/fursat_arjun_kanungo_song_free.pdfIn PDF document text
    • http://tumirukilifu.rf.gd/serekarudijudabajezex.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/rupeje.pdfIn PDF document text
    • http://nuxumejaxumem.epizy.com/cox_cable_tv_guide_va_beach.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_off0000fc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC02 5544 bytes
SHA-256: 2496496972f54cdd3040f8b56aefa23ce17ace255e3f5f0a7a569c3ed9deb73c
font_01_sfnt_off00010ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED7 10924 bytes
SHA-256: 2710fb4409126c4dde0e75bb9db8968415c9942017ab30b16270c6b2ef5c0f65

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