Malicious PDF — malware analysis report

Static analysis result for SHA-256 004913c13d2cdaf8…

MALICIOUS

PDF

85.9 KB Created: 2021-03-27 12:03:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 81ad2d6a4e9a31b39933e1332b7e6b74 SHA-1: 1b1c59bf0aecba9726edd35bb02e37f7c46cada2 SHA-256: 004913c13d2cdaf8d83ae0dadfdc6f27915d5733ca3b7a13188f49563b9d4cbc
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://jacksth.ru/award?keyword=angular+blob+download+pdf PDF link annotation
    • https://cdn.sqhk.co/feluxolid/fVxjeif/lancaster_archery_tournament_2021.pdfIn PDF document text
    • https://cdn.sqhk.co/fixakozumad/Wxrhaia/nedewekodedugili.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/MHiguo6/presretaci_u_republici_srpskoj.pdfIn PDF document text
    • https://cdn.sqhk.co/xewazezikufi/ejfbGYc/pba_tour_schedule_2018.pdfIn PDF document text
    • http://luwepetewegumot.iblogger.org/social_entrepreneurship_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gasalikuviz/c5Eie5I/sovanuvinakupuv.pdfIn PDF document text
    • http://vusejulene.iblogger.org/nabufulakojodosefetaw.pdfIn PDF document text
    • https://jagusidenoz.weebly.com/uploads/1/3/4/9/134902343/duribagon_tevonaxav.pdfIn PDF document text
    • https://kevefizi.weebly.com/uploads/1/3/1/8/131871405/suputozare.pdfIn PDF document text
    • https://wemadaxofopu.weebly.com/uploads/1/3/4/7/134752229/tedisipezilup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_78d2a2bdbd7043338ec24c570902d783.pdf?index=trueIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_16fb3e048bac4483ace20dc8b820e558.pdf?index=trueIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_0b359220a8594755a8f8cb0a2ff05c73.pdf?index=trueIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_7c993d16139d4df598c9150293210cd7.pdf?index=trueIn PDF document text
    • http://faxogego.epizy.com/9737747896.pdfIn PDF document text
    • https://87deab66-c645-46c6-955a-dbc2758d34a6.filesusr.com/ugd/302fc9_cc79f1c3ee8647feac13ca5a2926392c.pdf?index=trueIn PDF document text
    • https://7d33af4c-acfd-4996-9436-348e89828b5b.filesusr.com/ugd/289672_9d4e6770359742ac84b51a4cfd2a8438.pdf?index=trueIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_45cb20573a8549a5be1061f3e712532b.pdf?index=trueIn PDF document text
    • https://d5aacb37-8766-4234-9cc8-c2ec3b911aba.filesusr.com/ugd/1e723b_846c5cdda5e942228ea71a39388a6784.pdf?index=trueIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_c53e3f7e483f4648b6ee46e933a4c1c2.pdf?index=trueIn PDF document text
    • https://e8e87dc5-637d-47ba-9de6-e7d98d123d78.filesusr.com/ugd/a69a03_7b2d1e385e4640359a7ad96ff05e3fe9.pdf?index=trueIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_b7eb8fc4a0eb4ee09d240d2d6a947579.pdf?index=trueIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_21000ef399774c47ac58c1b92544fc22.pdf?index=trueIn 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_off0000fb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB93 5252 bytes
SHA-256: c5e04a968d30984d0e5f02446fe789f6ed8b3cffad66fc15a2eb0f25140f91ab
font_01_sfnt_off00010d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8B 6520 bytes
SHA-256: 2b06acabc83c103f45996e017315cb76e3f1c09b7639213d31c46cd7022ad666
font_02_sfnt_off00011f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7F 11864 bytes
SHA-256: 2f054acb0ec2de697303108fcb601855b77aad89bf8f984f9bd4de03b1aab072

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