Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d8ad5d0e188727…

MALICIOUS

PDF

69.3 KB Created: 2021-01-16 05:12:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 15e6d65c32cd05a86ae62f914e2a60b9 SHA-1: 859a03e673bee7c96df98c7c3aa5702b9d1e5349 SHA-256: 83d8ad5d0e1887276db2de5dc34a895678a25c658687bdf7e77a9a344401365c
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains a high number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser extension or update, a common social engineering tactic. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://traffset.ru/123?utm_term=gameguardian+apkpure+download PDF link annotation
    • https://bevarepovorumi.weebly.com/uploads/1/3/2/3/132303359/norokokajuxoneve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450048/normal_5fbc11b09605e.pdfIn PDF document text
    • https://navijaxilof.weebly.com/uploads/1/3/2/6/132696044/26e9e25.pdfIn PDF document text
    • https://site-1178235.mozfiles.com/files/1178235/fireboy_and_watergirl_2_walkthrough_level_34.pdfIn PDF document text
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/6a87a6a4a2594.pdfIn PDF document text
    • https://site-1167986.mozfiles.com/files/1167986/lizexuzawex.pdfIn PDF document text
    • https://gaturavokig.weebly.com/uploads/1/3/4/3/134317265/noxipazadalijal-famaza-polanoko-limagofe.pdfIn PDF document text
    • https://site-1178921.mozfiles.com/files/1178921/artificial_intelligence_movie_review.pdfIn PDF document text
    • https://site-1172895.mozfiles.com/files/1172895/texovejeneveromume.pdfIn PDF document text
    • https://momaramurelu.weebly.com/uploads/1/3/4/3/134309976/1758262.pdfIn PDF document text
    • https://komimarokobak.weebly.com/uploads/1/3/4/6/134604519/kagesif_mezulomojinop_xozusa_xewabuw.pdfIn PDF document text
    • https://zofomuwane.weebly.com/uploads/1/3/4/0/134040850/9209091a12bf416.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/ae51dd4.pdfIn PDF document text
    • https://site-1168218.mozfiles.com/files/1168218/facebook_video_downloader_for_uc_browser_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD403 5288 bytes
SHA-256: 219da4f3a06f2538301e8e7199409cc243cfe21167cc458e94117fa5ffb2bc14
font_01_sfnt_off0000e600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE600 10048 bytes
SHA-256: 867b8ed9c6755541331890845293fa2bafc984d438c7c00fe02bb53a714b573a

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