Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a7d5078f484f7d…

MALICIOUS

PDF

76.6 KB Created: 2021-03-31 23:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b36aa6ee947d5d1b658601a228fd42f3 SHA-1: f777986dbd625c69bcef8d99667c4c5e7bc96661 SHA-256: 42a7d5078f484f7de8783e908bef7f4349eee4aab2fa0f05302281395c04213b
226 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure for software cracks, and the 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates it's designed to trick users into downloading a password-protected archive, likely to hide a malicious payload from initial scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://baarspo.ru/award?keyword=pdf+annotator+6+crack PDF link annotation
    • http://arm-watch3.club/funuvijugesuzamazurekaxihyl8.pdfIn PDF document text
    • https://cdn.sqhk.co/kowipopi/Orzid14/supposedly_meaning_in_malayalam.pdfIn PDF document text
    • https://cdn.sqhk.co/gojelonub/kgcAjhc/20249753894.pdfIn PDF document text
    • http://begemot.space/can_you_download_sketchup_freert157.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/5wbOhdp/stickman_surfer_tattoo.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/ihjibjb/tuzekepasiv.pdfIn PDF document text
    • http://copyright-central-media.com/gupusenolezar111.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_5da5cc63641740d2ac29e1834c6555c6.pdf?index=trueIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_01119b76a29745eab9169a01f521e7ac.pdf?index=trueIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_70f7ec1f01a64886b42578623408dcfd.pdf?index=trueIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_1bd6382ca95e46a9a939c377b4d99c45.pdf?index=trueIn PDF document text
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_45157238c2e54769b67465dcc0bb939d.pdf?index=trueIn PDF document text
    • https://bbf05351-1c49-455c-8ea8-df349977a4d5.filesusr.com/ugd/15c6d6_a5d917cce4f94f6983ddeb130fc1ee28.pdf?index=trueIn PDF document text
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_ad81405f55a744db967a112dd817ed9c.pdf?index=trueIn PDF document text
    • http://melovetewaw.rf.gd/oakley_prescription_safety_glasses_with_side_shields.pdfIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_a42515ce5c4444c5a404dabca9acfc61.pdf?index=trueIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_8c78984e3e634ef7b6c630bdf2358820.pdf?index=trueIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_5ea5086087b64c3ba1b95794d1cb0e66.pdf?index=trueIn PDF document text
    • http://nutujetis.rf.gd/55102863185.pdfIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_dbcf137ec1854e7bb50917e87be9b42f.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF21 5024 bytes
SHA-256: 3ca6d3247cff4cf06ff2f9ec94ca2c5f8226bb47cdef1ee9230961432f622f88
font_01_sfnt_off0001004e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004E 11076 bytes
SHA-256: 492b8f7c3103aa2b05786a1cdc3762c55966138731944a337a6f4d3b265852be