Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0767a620d2e54f4…

MALICIOUS

PDF

70.5 KB Created: 2020-11-16 15:40:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: faa8d952ec394b6e1cd0be5d6ac16010 SHA-1: ea86e8fc901ad71aef17b258d633ceddd254161f SHA-256: a0767a620d2e54f40560de00a961ba2702f3b5ad4f5840265315188db85738e4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffnew.ru/123?utm_term=haier+mini+fridge+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483610/normal_5fab84ce2ff87.pdfIn PDF document text
    • https://naxibozagut.weebly.com/uploads/1/3/4/5/134580084/bidawofebaguteju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372383/normal_5f8e92a2e60fc.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/bb83642d4537.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/tegorokimomasisaditelop.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/unblocked_games_for_presents.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/28216665946.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/24690497182.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/english_arabic_law_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/fuwavinotojesusususoti.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/zewaniwo.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/verogozapowizudo.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/pinoxuzijetixupoxesozurux.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_off0000d7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E0 5008 bytes
SHA-256: c59cc4b5d476cd3896014211743fb9ae7953e8df9e68c3ac53fb98699233ff08
font_01_sfnt_off0000e8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D2 10740 bytes
SHA-256: c32dce8811c4428edbc043eb4397e71007fa5097e1ed4f2197a53eeee8f2a839

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