Malicious PDF — malware analysis report

Static analysis result for SHA-256 844d9e6faede933a…

MALICIOUS

PDF

75.4 KB Created: 2021-02-09 20:26:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bc5fc5380a360c4ca76151e6881e9e17 SHA-1: 5fc58d252bf48a29cc1308c1a31b2d6c714d69a1 SHA-256: 844d9e6faede933a7c9fc3840ff6dff31e222a225a15d3cc67696407750edee1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains keywords related to an 'answer key', a common lure for phishing attacks.

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/wb?keyword=bpsc%20answer%20key%20official PDF link annotation
    • https://xowitato.weebly.com/uploads/1/3/0/7/130776358/pezikojotobale_jaxizeguf_takuval_maziliril.pdfIn PDF document text
    • http://wetikufuwigiwox.iblogger.org/foam_sheets_for_gun_cases.pdfIn PDF document text
    • https://ramasiwo.weebly.com/uploads/1/3/5/3/135390431/b01640.pdfIn PDF document text
    • https://zuvumurujibuza.weebly.com/uploads/1/3/0/7/130739557/zogelinijipulepej.pdfIn PDF document text
    • https://vobilazi.weebly.com/uploads/1/3/5/3/135300702/c46c133c3df.pdfIn PDF document text
    • http://xupenirulavep.iblogger.org/upper_gi_bleed_management_guidelines.pdfIn PDF document text
    • https://jizufuvarax.weebly.com/uploads/1/3/1/1/131164460/f0791b37d35a844.pdfIn PDF document text
    • https://kogevinipuban.weebly.com/uploads/1/3/4/5/134514077/3bb2b1.pdfIn PDF document text
    • http://pimovanurebi.22web.org/mla_style_annotated_bibliography_format.pdfIn PDF document text
    • https://litusavetedi.weebly.com/uploads/1/3/4/4/134445261/45ff43fc383.pdfIn PDF document text
    • https://bosowumajozidu.weebly.com/uploads/1/3/0/7/130740465/3aae1f0ba935d.pdfIn PDF document text
    • https://buzelobuledu.weebly.com/uploads/1/3/1/3/131397981/7322540.pdfIn PDF document text
    • https://ridimejaxokixis.weebly.com/uploads/1/3/5/3/135340331/1624158.pdfIn PDF document text
    • https://baveretam.weebly.com/uploads/1/3/5/3/135314503/zifokobuteraromene.pdfIn PDF document text
    • https://turetufifej.weebly.com/uploads/1/3/4/5/134500159/pilaveni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://semiwexojexudu.epizy.com/ledoti.pdfIn PDF document text
    • http://tuserigetov.rf.gd/automotive_industry_definition.pdfIn PDF document text
    • http://zubumedi.rf.gd/53871220799.pdfIn PDF document text
    • http://banobozibijur.epizy.com/95315197381.pdfIn PDF document text
    • http://xofiketur.rf.gd/47228529934.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_off0000eaed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAED 5316 bytes
SHA-256: 86885aa575ef5231c195f18f74c8fc5abf9178c877aa8555302ba49d2fba0dce
font_01_sfnt_off0000fd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD32 10196 bytes
SHA-256: 83cccf87cc213ef2e1b644f53d5e222de5f8fab5e1ac536a7a77e4971f54fad2

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