Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ef2b742970b37d…

MALICIOUS

PDF

60.9 KB Created: 2020-11-25 15:58:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e5fdf301b232c83fb7caf7f84c513454 SHA-1: 9624544adb5c12b258a77317fbfd4809936e80e3 SHA-256: f1ef2b742970b37df72ebbb1ee238d3e29ce14baa01faa4d450a27a50b6fad44
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, identified as a 'PDF SEO LINK FARM' heuristic, directing users to various websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the presence of external links suggests an attempt to redirect users to malicious content or download further payloads.

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 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://traffset.ru/aws?utm_term=anbe+sivam+movie+songs+free++starmusiq PDF link annotation
    • https://mebijakonenu.weebly.com/uploads/1/3/4/4/134458360/wukamaki.pdfIn PDF document text
    • https://dukutisanag.weebly.com/uploads/1/3/4/3/134318107/257785bf.pdfIn PDF document text
    • https://xuwejemeluk.weebly.com/uploads/1/3/4/3/134314543/nubudoripojobave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_5f89168120c2b.pdfIn PDF document text
    • https://genaseturatu.weebly.com/uploads/1/3/4/6/134615139/d3a39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468812/normal_5fad7d304f9df.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/donarepemi/types_of_inventory_reports_in_tally.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/cheats_for_monster_legends_android.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/carbohydrates_structure_and_classification.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/auxiliary_verbs_exercises_upper_intermediate.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/magruders_american_government_online_textbook.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_off0000b151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB151 5368 bytes
SHA-256: a09b9f3b46bdba30ab0c24c24505654b4841811f53e82c39d454acc4125dcfd2
font_01_sfnt_off0000c386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC386 10436 bytes
SHA-256: 767b89bd98e74ea27ac68d689c91044483097d290a68e62331ac418ae294af26

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