Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bbfdd81133b93f…

MALICIOUS

PDF

59.3 KB Created: 2020-12-21 17:42:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a0f56d3d9ae4bec9c09e912bdc778b67 SHA-1: bd88348554614341cc8a8c38b78b670f78e68813 SHA-256: 87bbfdd81133b93fef3b205bcddaec8adbf556c38516b32f2645380283d131eb
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious. The primary URL, 'https://trafffi.ru/aws?utm_term=bakuman+season+4+sub+indo+batch', suggests a phishing or scam attempt disguised as a search result. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://trafffi.ru/aws?utm_term=bakuman+season+4+sub+indo+batch PDF link annotation
    • https://pufoxufuzevelo.weebly.com/uploads/1/3/4/4/134486621/9446180.pdfIn PDF document text
    • https://lerelapukuvi.weebly.com/uploads/1/3/0/7/130740054/143503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500001/normal_5fd7d668ce3a0.pdfIn PDF document text
    • https://faxufoxexukixel.weebly.com/uploads/1/3/4/4/134455740/2ec84620d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454671/normal_5fd885f1d911a.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/6258688.pdfIn PDF document text
    • https://rekifunesivi.weebly.com/uploads/1/3/4/4/134404589/6921311.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/7467916.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/xunilukegez/ch_play_pending.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/96375867518.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/btd_mod_apk.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_off0000ad23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD23 5392 bytes
SHA-256: 40da95272057920e34ab5bdd61c59230400bd26d64cc209c857e8069e81826b4
font_01_sfnt_off0000bf5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5F 9728 bytes
SHA-256: 20f0ed77ffa386b40bfbf8a70570e3033adebbc768c1acfad9fedd81a7e89a23

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