Malicious PDF — malware analysis report

Static analysis result for SHA-256 751a15e5cebbc70c…

MALICIOUS

PDF

72.4 KB Created: 2021-06-03 13:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d0664314dce29a9103dde43972b26c63 SHA-1: 3f06a63481f6c6444f6c35a60b89a95e66570d84 SHA-256: 751a15e5cebbc70c451ed4deee88859a033af9c6a150e09b26d62ca0665014be
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 0.9991

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://irlanc.ru/pbw?utm_term=heritage+india+quiz+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367283/normal_602dea339b25e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448343/normal_60b80d0d2faff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386092/normal_5fd356471d586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426541/normal_6030460094d54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527357/normal_5ff4a31fdf744.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471946/normal_6019ba0eef506.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384048/normal_5fecf46f8c028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454545/normal_60148ade95186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459036/normal_60146c02e4892.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454422/normal_5ff090087ae76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470972/normal_5ff880b1388f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453144/normal_60622ad9c937a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368223/normal_60344589e5db6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374518/normal_6039f85a2e5ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469349/normal_6034f1bd1bcfb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mutoteja.pbworks.com/w/file/fetch/144502197/59457600121.pdfIn PDF document text
    • http://xovakovawup.pbworks.com/w/file/fetch/144523140/42727323791.pdfIn PDF document text
    • http://nubuzefi.pbworks.com/w/file/fetch/144553236/3813856492.pdfIn PDF document text
    • http://nubuzefi.pbworks.com/w/file/fetch/144532626/56958641724.pdfIn PDF document text
    • http://sonopewobu.pbworks.com/w/file/fetch/144419889/what_do_the_numbers_mean_on_italian_pottery.pdfIn PDF document text
    • http://zalonuzojeru.pbworks.com/w/file/fetch/144450456/shaolin_soccer_english_dub_free_download.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/w/file/fetch/144413991/set_up_google_home_on_windows_10.pdfIn PDF document text
    • http://tosuvop.pbworks.com/f/5854921319.pdfIn PDF document text
    • http://godekazonigi.pbworks.com/w/file/fetch/144432753/causality_and_determination_anscombe.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144412449/kowevemojopulusirixafuva.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_off0000dbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEF 5340 bytes
SHA-256: f58a80a820d3ac0fc71a02443eade26b674b33c3900adb7b0aed4588286c4fad
font_01_sfnt_off0000ee23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE23 11220 bytes
SHA-256: ea0e3ae11056e25eac44f6ea11331cf9a51a750c2ede8a69d8027b89e99d3480

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