Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b8eed7049c64ec…

MALICIOUS

PDF

157.2 KB Created: 2021-02-23 16:20:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 600623945843912ebb17196c065c475e SHA-1: 6af5173f4ac1274b5ab4a11799edb0b3ecf0ea39 SHA-256: 43b8eed7049c64ecaf713905e47491c5edc0ff6d62df149b412d8a64c1effa21
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and forming a link farm, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct user-facing text that would indicate a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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/wix?keyword=loose+definition+explanation PDF link annotation
    • https://wakukaxowemaba.weebly.com/uploads/1/3/5/3/135303752/528478d5b7b18.pdfIn PDF document text
    • http://gratoraama.website/how_big_is_30cm_x_40cmsij3o.pdfIn PDF document text
    • http://vadonodip.22web.org/57290466997.pdfIn PDF document text
    • http://naturfresh.fun/50581133583j1mi1.pdfIn PDF document text
    • http://penoligis.22web.org/bogerafuneriwolaba.pdfIn PDF document text
    • http://help-verification.com/safizexarthqr.pdfIn PDF document text
    • https://sijetuso.weebly.com/uploads/1/3/4/4/134499475/291f56.pdfIn PDF document text
    • http://zathkatow.xyz/gestational_diabetes_rcog_guidelineswh92k.pdfIn PDF document text
    • https://kotevopokevunab.weebly.com/uploads/1/3/4/5/134590751/5182020.pdfIn PDF document text
    • https://mezikemopirexat.weebly.com/uploads/1/3/5/9/135993778/tazimeve.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482415/normal_5fced6b8b0206.pdfIn PDF document text
    • http://sedouche.xyz/cartas_de_san_pablo9wl4a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sudawedano.rf.gd/all_army_combatives_tournament_2019.pdfIn PDF document text
    • http://nipuwiwabo.rf.gd/the_book_of_thoth_audiobook.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_off00022d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22D4C 4948 bytes
SHA-256: b4cfa9796bd2e5518452bd1a453163cf727028ebbb6bfbe662e07567f22f4743
font_01_sfnt_off00023e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23E43 12148 bytes
SHA-256: 2995ef18499e5517568e3c71bbb3041120a867a928a510461be582ce8c52c79c

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