Malicious PDF — malware analysis report

Static analysis result for SHA-256 24515dcbf5862e53…

MALICIOUS

PDF

72.6 KB Created: 2021-02-18 16:52:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5ca934eae49621a3f7898607709ad788 SHA-1: 732944c12c53ba27cb5c5b4f3e0d56fe77dacf0a SHA-256: 24515dcbf5862e534702f789e020e7f44dd6027e7f84e8e00241c6d73178f684
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to a 'review worksheet answer key'. No scripts were extracted, but the presence of numerous external links points to an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://crophysi.ru/wix?keyword=the+properties+of+matter+review+worksheet+answer+key PDF link annotation
    • https://cdn.sqhk.co/lamiwifa/Y4n5gi8/vewimavivudax.pdfIn PDF document text
    • https://cdn.sqhk.co/nakijalufiw/jhigEgP/lyrics_video_maker_app_free_download.pdfIn PDF document text
    • https://zekigoduse.weebly.com/uploads/1/3/4/3/134336209/5180264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417046/normal_5fe8487431199.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462678/normal_5fc94d3a97e2d.pdfIn PDF document text
    • https://xaxarudo.weebly.com/uploads/1/3/0/7/130740130/1869733.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405437/normal_600baaac540f3.pdfIn PDF document text
    • https://kepigepejabuji.weebly.com/uploads/1/3/4/3/134315220/jowagigimow-korijiwaxaset-makabojel-dufebekexutow.pdfIn PDF document text
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/zefawuzuxe.pdfIn PDF document text
    • https://cdn.sqhk.co/salobosemiv/70XQZyU/bollywood_song_quiz_game.pdfIn PDF document text
    • https://xepezexitig.weebly.com/uploads/1/3/0/9/130969834/9140443.pdfIn PDF document text
    • https://rasazumeg.weebly.com/uploads/1/3/1/4/131454762/45fdb24.pdfIn PDF document text
    • https://lameperitilexi.weebly.com/uploads/1/3/1/1/131164355/30f1d5a3816.pdfIn PDF document text
    • https://gifiboluf.weebly.com/uploads/1/3/2/6/132681188/pobipas_kupiwixojetu_wisoz_lofirekizulif.pdfIn PDF document text
    • https://zemijawa.weebly.com/uploads/1/3/1/0/131070152/4878771.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/dadupawo/89812447503.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/3289106195.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/arthroscopy_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/68260290918.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_off0000ddcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCB 5376 bytes
SHA-256: 21f080ff5d64484655efa7c0588eee5ecc4ab7105f276a2661df3462db7fbc03
font_01_sfnt_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 10812 bytes
SHA-256: 1a6a509894dc2501c3fb8d73b1617ce1668c24a3e3e1a2b82d93b94aeb1f3905

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