Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83e0d196babbecc…

MALICIOUS

PDF

82.2 KB Created: 2021-04-07 00:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 207c36a6e31ce62dfc80552620340b23 SHA-1: ec98971010ca6bd678c194956667170f01c9cb2a SHA-256: e83e0d196babbeccf77d4052e40ebbd7fb226f55cf4b01c30824058ab907f9e0
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, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to 'algorithm and data structures tutorial pdf'. The presence of numerous external links indicates an attempt to lead the user to potentially harmful 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://zajinet.ru/award?keyword=algorithm+and+data+structures+tutorial+pdf PDF link annotation
    • https://senekuzoje.weebly.com/uploads/1/3/5/9/135978249/1896262.pdfIn PDF document text
    • https://cdn.sqhk.co/mivadunoxo/fgd6igZ/3506050219.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/jgj77hj/rifixakotukibiwawifefu.pdfIn PDF document text
    • http://xepewifub.mygamesonline.org/ortopedia_y_traumatologia_pediatrica.pdfIn PDF document text
    • https://xupotigoxurope.weebly.com/uploads/1/3/4/6/134657266/tagez_favad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nijufunirel.rf.gd/bi-_84_form_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4b266fe-6f07-4715-b73e-7e744bdd595e/zesegelolusupakevidi.pdfIn PDF document text
    • http://darotevu.rf.gd/1435569941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/621c59d3-34d0-4cea-a9ce-2624194c4ecb/how_to_read_driving_test_score_sheet_wa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09ad4730-ea24-4bf6-bb92-c7701f920590/705539764.pdfIn PDF document text
    • http://zilowovuv.atwebpages.com/morfologi_annona_muricata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caa54df4-7f87-498f-98fe-a49bf43dc4b8/windows_hotkey_to_rotate_display.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/586c3353-aaf2-4016-9a24-afb8674d4a75/36063098771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/688f01ca-f729-4eaa-9a1d-1377ba176ef6/gaxiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eb7bd10-df88-4f49-9c9f-6952e40db66a/which_word_best_describes_martin_luther_king_jr.speaking_style.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a0a0785-3f8b-4be6-b54f-efc7c04f6c26/72652495680.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_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 5556 bytes
SHA-256: 234efd3bf8b72a32959bf6baba0b7457a469be58a01083fff543ba6acb821bc5
font_01_sfnt_off000115cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CF 11120 bytes
SHA-256: f4f4f25fa03be83dd661a22309167dddf3cc3cc1758c2556c83e9f117ed25f70

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