Malicious PDF — malware analysis report

Static analysis result for SHA-256 e110afd44c20fbd7…

MALICIOUS

PDF

70.5 KB Created: 2020-11-12 23:08:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 7f6d5fee36c2f02cd42592d26cfb28bf SHA-1: d3cce0716a7e1b1a0088b3ccf102a6b9e85aebb8 SHA-256: e110afd44c20fbd7ee434c87105046da3a02b5122e62bb945575bab11d17956d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=the+pursuit+of+holiness+jerry+bridges+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377391/normal_5fa73a6d2ad87.pdfIn PDF document text
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/24f3b77f4ce8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415081/normal_5f94904646d54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368756/normal_5f88bc5a57ebd.pdfIn PDF document text
    • https://supixevobaje.weebly.com/uploads/1/3/4/3/134356264/ratejixazovob.pdfIn PDF document text
    • https://tevitoretej.weebly.com/uploads/1/3/2/6/132680933/9668824.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/luvusunovinev.pdfIn PDF document text
    • https://soremezu.weebly.com/uploads/1/3/1/0/131070226/e96725878976b5.pdfIn PDF document text
    • https://dojifidixiwaji.weebly.com/uploads/1/3/4/3/134372722/telopad-xesavi-zobixej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/86257ad0-b269-483b-87e6-282913415043/nuvunelasopi.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/difference_between_alkali_and_base.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad7fa5b0-b23f-4e6f-9926-5269c3750af7/hackerrank_problems_and_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/bacopa_monnieri_review.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_off0000d84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84F 5360 bytes
SHA-256: 9a3fb912101a13e7f707d5d7cd878fbdea8372125c0ae8ae9f5f3e45f1051728
font_01_sfnt_off0000ea8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8D 10204 bytes
SHA-256: 2a175e17576397ac3ccc245f25055ed0b56ae5eaaf8c1e2355d84e0fff73c3c2

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