Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d9b0c93d24df14…

MALICIOUS

PDF

91.0 KB Created: 2021-03-25 08:37:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9aeb88f53216add3d3dddf1431d3ba0f SHA-1: dc0fd5e0156b559e7dae830c80231f6a9be84afd SHA-256: d5d9b0c93d24df14349667933f5e710c74ea4be90e09d048afc7c71771c34517
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicating a link farm or redirection strategy. ClamAV and ML classifiers identified this as malicious, specifically a phishing trojan. The presence of embedded URLs and the PDF structure strongly suggest an attempt to lure users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=mario+flash+games+2
    • https://cdn.sqhk.co/bililusele/idicMNN/fury_road_black_and_chrome_4k.pdf
    • https://cdn-cms.f-static.net/uploads/4496605/normal_601f45d236ecc.pdf
    • https://static.s123-cdn-static.com/uploads/4419235/normal_6003505f17c18.pdf
    • https://cdn-cms.f-static.net/uploads/4413973/normal_5fd820697d040.pdf
    • https://tirusagoxavux.weebly.com/uploads/1/3/5/3/135329940/nanufelemaki.pdf
    • https://jasebezaf.weebly.com/uploads/1/3/4/6/134630561/7e87440acb1e19.pdf
    • https://cdn.sqhk.co/mowamukar/hiWhhuu/2803449154.pdf
    • https://cdn-cms.f-static.net/uploads/4413848/normal_6057cc25bc9e4.pdf
    • https://static.s123-cdn-static.com/uploads/4421366/normal_5fc7552e6fd79.pdf
    • https://cdn.sqhk.co/kisasizaro/YNjhYYr/52630807709.pdf
    • https://xegupilu.weebly.com/uploads/1/3/2/3/132303007/c69ead7.pdf
    • https://static.s123-cdn-static.com/uploads/4464532/normal_5fe44d1ada109.pdf
    • https://cdn-cms.f-static.net/uploads/4480423/normal_600beedb8c23d.pdf
    • https://cdn-cms.f-static.net/uploads/4451206/normal_601269517dff1.pdf
    • https://pumujeguda.weebly.com/uploads/1/3/5/3/135330988/8146207.pdf
    • https://static.s123-cdn-static.com/uploads/4381344/normal_5fc60176cac7a.pdf
    • https://cdn-cms.f-static.net/uploads/4491946/normal_6041bbd1022fa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://luzigipo.epizy.com/dixieland_band_sheet_music_free.pdf
    • http://pifazudiso.rf.gd/takudexelura.pdf
    • https://uploads.strikinglycdn.com/files/4370ddcc-980b-4062-b61f-0e5780567bc4/what_is_the_idea_of_color_constancy.pdf
    • http://xidiredojowezi.epizy.com/54883490330.pdf
    • https://uploads.strikinglycdn.com/files/8fbdf885-4a8d-4c45-bbe9-d95bd9dd2e4b/40115085144.pdf
    • http://xixelenagogebaz.epizy.com/harrison_bergeron_by_kurt_vonnegut_audiobook.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000125fc.bin
6b1e8752122159c3fca9033d695a09e51061bae8e1e452eb5ce589336789035c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125FC 5316 bytes
font_01_sfnt_off000137f8.bin
f19bbfd30340039ccdf4bcac7fe6645edca747b1325e81fb78d23a6803ceb6c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137F8 11284 bytes

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