Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e52cd1a3c0d8688…

MALICIOUS

PDF

83.1 KB Created: 2021-03-21 07:12:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: fb67cd244b3e11d8094b31d5a16f9721 SHA-1: dc9e8687189a0276555b1cd7e58c403763b2dde0 SHA-256: 1e52cd1a3c0d86885babee03e165782a3bd08dc5090302e8ed538b72fe1af35c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm designed to manipulate search engine results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links point towards a phishing or SEO spam attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://gimoguvi.ru/wix?keyword=what+is+child+star+syndrome PDF link annotation
    • https://cdn.sqhk.co/xegigujatefa/jhiMmic/text_message_ringtone_download.pdfIn PDF document text
    • https://cdn.sqhk.co/besuduxikuvo/idwjgfW/gimaj.pdfIn PDF document text
    • https://cdn.sqhk.co/pibusupi/i4FbVgj/tofanubukusifufuwef.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/NEBnhcj/98573264566.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/wRgcGia/22296658240.pdfIn PDF document text
    • https://cdn.sqhk.co/duditizonut/jbihjdi/loxewabutone.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/Diahghc/spotlight_x_room_escape_walkthrough_level_6.pdfIn PDF document text
    • https://cdn.sqhk.co/giwumazusew/hidicsW/novebo.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/7QWNp2b/app_to_write_on_ipad_free.pdfIn PDF document text
    • https://cdn.sqhk.co/jalinutaxos/HifQcih/tujubemupo.pdfIn PDF document text
    • https://cdn.sqhk.co/dagorabowixu/SigcOjb/20865217477.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/aDhcxjh/deliparurajoromigi.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/XgfAaig/ratorosizojolagogizil.pdfIn PDF document text
    • https://cdn.sqhk.co/susojitigi/ichdZRS/muscle_car_drift_simulator_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/javijaxim/0VjdNPP/acrylic_nail_ideas_2020_summer.pdfIn PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/1BI36Ns/vixozumuvetoxiwoduwu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_1aa367ec30ee4185a10408fa3ba6d34a.pdf?index=trueIn PDF document text
    • https://562a32fb-e9c8-4d8f-ac7e-a760da58c396.filesusr.com/ugd/68ec97_dd9768e2088842e29582209727eeaf61.pdf?index=trueIn PDF document text
    • http://ruvaseravijuged.rf.gd/fapefilijiropesob.pdfIn PDF document text
    • http://xadugatu.epizy.com/malakand_board_9th_date_sheet_2019.pdfIn PDF document text
    • http://vetozidute.rf.gd/zuwoxovegorevewaxazav.pdfIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_d083741acd6c49d9a04da4309205c2a7.pdf?index=trueIn PDF document text
    • http://mitegoma.rf.gd/71183318081.pdfIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_e3db382442b84b988242301967c020c7.pdf?index=trueIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_e6b440d13f4d47439a1d3cc321a0f5f5.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_off0000fad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD9 5080 bytes
SHA-256: a6ff2ba45ae0c18e05e8aa62ab93a1e50576b34f7853955bc07c8fd37b024fc2
font_01_sfnt_off00010bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEE 10748 bytes
SHA-256: 86531d7931b055a09923ea95df569fd963c8b30c1c90b15d325007660efb0b25
font_02_sfnt_off000130b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B0 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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