Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda3267d7d48b123…

MALICIOUS

PDF

73.9 KB Created: 2021-03-23 18:02:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 965fe3afb0bc371fb2274e283f335682 SHA-1: 7667b8fa6f6053311e51b5bb50f44c79df96d27c SHA-256: fda3267d7d48b123921c9a226911b843de6c481b2ffe58d6cc8430ecbc1eb293
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/strik?utm_term=how+much+money+do+housekeepers+make+per+hour
    • https://cdn.sqhk.co/kofatuziwu/jaJjhfE/1050045135.pdf
    • http://namixojebeku.iblogger.org/jevemamivutomon.pdf
    • https://cdn-cms.f-static.net/uploads/4373983/normal_6024626dcd91c.pdf
    • https://cdn.sqhk.co/riragimi/ghhjdDT/judicial_review_court_case_examples.pdf
    • https://dizeremugeb.weebly.com/uploads/1/3/4/2/134235396/7964296.pdf
    • https://static.s123-cdn-static.com/uploads/4456377/normal_5ff75f432a9d9.pdf
    • https://cdn-cms.f-static.net/uploads/4446027/normal_6029f458909e4.pdf
    • https://dijemafewume.weebly.com/uploads/1/3/5/9/135992897/7371415.pdf
    • https://cdn.sqhk.co/waxixojapu/RgiH1e9/3379284468.pdf
    • https://cdn-cms.f-static.net/uploads/4389792/normal_604d68976d2b2.pdf
    • https://cdn.sqhk.co/jagibuvat/bTHbx38/97498823984.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dad5ad19-4514-453c-8365-ff79e7eaccb0/52617905157.pdf
    • https://uploads.strikinglycdn.com/files/377aa46c-4bcf-44ad-9298-143414264b68/what_is_data_science_work.pdf
    • http://xulifaxamozis.epizy.com/is_1_or_6_colder_on_a_fridge.pdf
    • https://uploads.strikinglycdn.com/files/449fac3b-9b02-44d0-b0fb-d9deb1bd93a6/easy_learn_korean_language_app.pdf
    • https://uploads.strikinglycdn.com/files/51f98f16-12d6-40bb-91c1-8ea5f707e562/is_it_rude_to_return_a_gift.pdf
    • https://s3.amazonaws.com/leteraxewe/consumer_reports_subscription_mailing_address.pdf
    • https://s3.amazonaws.com/titugome/tuxite.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e203.bin
cce13b9203427a6bc2d6ebff2ede3a5870cfa59a4413fec2c01587897aa82448		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE203 5500 bytes
font_01_sfnt_off0000f4a2.bin
ab90e6eb4da5dc8f0c47f4e4b888cbbb32626481b061206c16a45ebbef8a0aa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 10988 bytes

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