Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c82af69f658d6f7…

MALICIOUS

PDF

71.8 KB Created: 2021-03-23 06:51:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f2bc632fdcf2b0a4b5e47b54f06cd334 SHA-1: d969da8dcaa482a92bf32ea13759c12d849cfcb8 SHA-256: 0c82af69f658d6f7bc55544e9436f55b76bbd987dbc32781d1b81712f04ec210
226 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm designed to redirect users to potentially malicious sites. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a browser extension or update, which is a common social engineering tactic to facilitate credential theft or malware installation. The embedded URLs suggest an attempt to distribute or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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://jottigo.ru/wix?keyword=mighty+beanz+walmart PDF link annotation
    • https://bigarafomamuwi.weebly.com/uploads/1/3/4/3/134318607/8190432.pdfIn PDF document text
    • https://dudegakabiwuzab.weebly.com/uploads/1/3/1/4/131406663/vujidogot.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/bUjgjhF/xuged.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450248/normal_6017c5b08c690.pdfIn PDF document text
    • https://cdn.sqhk.co/gevagedubop/3Xgj0ij/can_you_cure_incurable_cancer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373788/normal_60006247974ca.pdfIn PDF document text
    • https://fudewuwadume.weebly.com/uploads/1/3/0/7/130740250/8269f.pdfIn PDF document text
    • https://cdn.sqhk.co/xafogatok/ramgfic/73028484342.pdfIn PDF document text
    • https://cdn.sqhk.co/xokekekav/jb6Jgf3/12829661701.pdfIn PDF document text
    • https://jajaleregonu.weebly.com/uploads/1/3/4/2/134235513/33f1793fc5.pdfIn PDF document text
    • https://motanaweda.weebly.com/uploads/1/3/4/3/134316912/f6cc6c0.pdfIn PDF document text
    • https://josuriwomevopi.weebly.com/uploads/1/3/4/7/134769094/vovisep_xozirotos_wipagodazezo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375891/normal_5fcc3c8541342.pdfIn PDF document text
    • https://nelunozulugekis.weebly.com/uploads/1/3/0/7/130739970/d7cb6a4fc8e9f2a.pdfIn PDF document text
    • https://widafesisitix.weebly.com/uploads/1/3/5/3/135321065/1dc281e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccf97e99-fb00-4ccb-91ef-409ba9f7b4f7/58064555772.pdfIn PDF document text
    • http://bemijeranokawu.epizy.com/1133436427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d12023-2b2f-423c-9568-52b10c728207/vezukotafakanexorezek.pdfIn PDF document text
    • http://kabexumowexugu.epizy.com/mice_and_men_summary.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_off0000d9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B4 5312 bytes
SHA-256: 719d0bfe3f64449a3150dbae5bac70112697f5ee6918d0c8e2103c790ed874da
font_01_sfnt_off0000ebcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCB 11192 bytes
SHA-256: bdeec7c44a9d2f6eef6e4ba2efaf71b7855364009de01f2d2be7e7e39792bee5