Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8bfb273c0f54551…

MALICIOUS

PDF

85.2 KB Created: 2021-03-27 23:55:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f84f63f665dfebc84ee88085a133553a SHA-1: 5ba765317b1c92ea2c4063b92ec784ea75b27b28 SHA-256: e8bfb273c0f545512ee85bc4e50db0e9b1106044246ffca12b3b4f983e880d87
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://botokaw.ru/aws?utm_term=how+to+get+to+wii+operations+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444856/normal_603929b94400a.pdfIn PDF document text
    • https://rijifupipi.weebly.com/uploads/1/3/1/4/131453414/sepukapevufet.pdfIn PDF document text
    • https://wufikaxom.weebly.com/uploads/1/3/4/8/134883002/6380099.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489596/normal_60545e4a97319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415065/normal_6029e654026a9.pdfIn PDF document text
    • https://kozowesojufeg.weebly.com/uploads/1/3/4/7/134717080/2842547.pdfIn PDF document text
    • https://mavuzoxawajike.weebly.com/uploads/1/3/0/9/130969593/8165247.pdfIn PDF document text
    • http://doniposebuk.iblogger.org/pumujonapobuzagemukesutez.pdfIn PDF document text
    • http://risunololalej.iblogger.org/acca_f3_past_exam_papers_and_answers.pdfIn PDF document text
    • http://jipuvojenibomig.22web.org/android_apps_making_software_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460723/normal_6005522d99656.pdfIn PDF document text
    • http://ketovud.22web.org/37052082687.pdfIn PDF document text
    • https://tuxipowu.weebly.com/uploads/1/3/4/6/134699968/dotodor.pdfIn PDF document text
    • http://sukozuxari.22web.org/cordless_phone_with_answering_machine_panasonic.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pamapubosozule.epizy.com/74598570120.pdfIn PDF document text
    • http://gipuluzew.rf.gd/thriller_english_movies_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/blacktop_mojo_in_the_air_tonight.pdfIn PDF document text
    • http://beliliwezewu.epizy.com/76599636482.pdfIn PDF document text
    • http://furosusuz.epizy.com/48889803934.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/lagu_cheating_on_you.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/36463662824.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_off00010b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B36 5192 bytes
SHA-256: 6bac26b403baa1aee8b3011f330142b8097436b8c78fefcca15ae5c80f91e3ba
font_01_sfnt_off00011cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDF 14048 bytes
SHA-256: 08b988733ea17d43a253909b0c3e496bd2cdace5e0bd67a304455a62da6aad6b

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