Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8165d597d5c379…

MALICIOUS

PDF

73.9 KB Created: 2021-04-19 08:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7076e334719ef4484d5efa65ce724c76 SHA-1: 8be1b9add53120ab86a1776af4faa17f823e308f SHA-256: ad8165d597d5c3790a25cebab0c9c48e963f27273bc88485d07fb00371d680a7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this, indicating the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=asus+p7p55d-e+deluxe+price PDF link annotation
    • http://wozilimesiz.mypressonline.com/95923723687.pdfIn PDF document text
    • http://lutafem.getenjoyment.net/wedunubogifaforoxiza.pdfIn PDF document text
    • http://bulubuzigajuzar.getenjoyment.net/star_wars_blueprint_posters.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kilarosine.atwebpages.com/2942028232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab58735d-065c-4a29-a225-c597836dbdaa/siluta.pdfIn PDF document text
    • http://kuxemozoxabonag.onlinewebshop.net/69475993940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9ff3f2a-a0ff-4b32-9fb6-321f3f5c8bb9/mxr_bass_compressor_pedal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8615dbd3-0516-4517-9022-b3493b79bc08/11_22_63_show_episodes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e077e1f0-a888-41d9-9767-d4efb81f6d1f/is_call_me_by_your_name_a_romance.pdfIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_7d359cab295547638fcca3336e288237.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/712488ea-02b6-40b2-b7e3-540eb652092f/hatha_yoga_benefits_for_womens.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0596ba9e-18f8-4db0-b5fb-0edd7e9efc98/fivavupujodob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bd679c2-2173-4765-8844-4e763e297a5e/55844402108.pdfIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_d626f1914eec4cc48197b24784947676.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F3 5152 bytes
SHA-256: 7ae2d8ec260e73bb97edd46febd68aec8b70cda5f4b2281698da5468f55f7bdf
font_01_sfnt_off0000f2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AA 11940 bytes
SHA-256: 8104b5c871c319b27b251106885118c2c10e8674deaf52951b680fe4ed024022

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