Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25bd12599a63473…

MALICIOUS

PDF

74.4 KB Created: 2020-11-29 00:15:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 88352d9a18d58bfd6345ef127acf49da SHA-1: 2446a56e2c6a6648461f86b26fd8b17f5589d520 SHA-256: c25bd12599a63473062fecefdba128ee6fbf2b2fcc2b5b9ab404c30d33dfa73b
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://ggtraff.ru/123?utm_term=elephant+and+piggie+books+reading+level In PDF document text
    • https://rebanurox.weebly.com/uploads/1/3/4/4/134490941/3947177.pdfIn PDF document text
    • https://dogamoduxex.weebly.com/uploads/1/3/4/4/134481485/wepepixejil.pdfIn PDF document text
    • https://lorotemorotur.weebly.com/uploads/1/3/4/6/134649447/14ea8ed63a2.pdfIn PDF document text
    • https://ramorebuba.weebly.com/uploads/1/3/4/8/134898890/705385.pdfIn PDF document text
    • https://kenasavale.weebly.com/uploads/1/3/4/7/134731907/wapesunaf.pdfIn PDF document text
    • https://daxusumupazi.weebly.com/uploads/1/3/4/7/134702932/lizevoraxuwobig.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/tifuxasorelav-sunagutigu-gikisifexixabot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9de3780e-0b18-4076-9ff4-0de4832c4bb7/58911925788.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/yahoo_fantasy_football_podcast_acast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbeefee3-34fa-48b1-b764-d4b2da02d700/goblin_dogs_pathfinder_2e.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/642320714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/472c13fb-de7c-4e04-8e4d-3b4f94dab5bc/nuvopebowutome.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/gulcin_tuncok_boyfriend.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/308ab578-2ee8-41d6-b8ac-05ef660aea9e/tinkerbell_pixie_hollow_games_full_m.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A8 5228 bytes
SHA-256: 6267530b22432d36be7c97bda36eaf274e4f7dc7f237c967d871f7bc8f383ff0
font_01_sfnt_off0000eb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5B 10384 bytes
SHA-256: e5dd822186037075047c2c019f299b03ca810a95e0eb014cd2353732ccd10ef1
font_02_sfnt_off00010e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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