Malicious PDF — malware analysis report

Static analysis result for SHA-256 a246d31baed3434c…

MALICIOUS

PDF

73.1 KB Created: 2021-02-22 03:39:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 80c5a21ec848e96af8af2af37a8c524d SHA-1: 195a423111b37701e96a216901c4898acf1b46f1 SHA-256: a246d31baed3434c4655a4bc49d82c33f944320b22dc678250887d02db1fda5a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/123?utm_term=what+is+the+history+of+christianity+in+liberia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473616/normal_60255bde390ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454977/normal_60015a4bc89db.pdfIn PDF document text
    • https://gimebupezepufo.weebly.com/uploads/1/3/4/5/134507041/zimibevuwek.pdfIn PDF document text
    • https://bufitalusiwe.weebly.com/uploads/1/3/2/6/132682607/9c32a1b89d4724.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/jdk1ijh/world_of_dance_ballet_couple_styles_and_emma.pdfIn PDF document text
    • https://cdn.sqhk.co/bogabixexuja/dhiOghA/black_mens_short_haircuts_2019.pdfIn PDF document text
    • https://jelakuge.weebly.com/uploads/1/3/1/8/131856802/036df9ff.pdfIn PDF document text
    • https://cdn.sqhk.co/pubisifibuj/ifbghqf/ludisil.pdfIn PDF document text
    • https://cdn.sqhk.co/xumobopore/TEJdTPx/6371917574.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494877/normal_5fd1c4aa88893.pdfIn PDF document text
    • https://riwurarelix.weebly.com/uploads/1/3/4/4/134484082/7173879.pdfIn PDF document text
    • https://xemizumelisiga.weebly.com/uploads/1/3/1/8/131856695/tobiwuz_kutetazalunol_fevokejixeni_koliwi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tutivute.epizy.com/how_to_configure_extent_reports_in_jenkins.pdfIn PDF document text
    • http://wosikomalaza.epizy.com/16769763298.pdfIn PDF document text
    • http://jejivosijej.rf.gd/sopide.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/47393591017.pdfIn PDF document text
    • http://lavavoju.rf.gd/any_video_player_for_android_apk.pdfIn PDF document text
    • http://livukizaxavubip.rf.gd/attack_on_titan_characters_season_1_vs_season_4.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_off0000df9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9F 5224 bytes
SHA-256: 467dace70a8e775cdd05b145cbb089a070b999975b5bd9ce125d4cd809fcefed
font_01_sfnt_off0000f177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF177 11480 bytes
SHA-256: 2dffd12688b3dcb00cb2c4f84446e2692c098bb7a5e905adab6cc0039cb768f9

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