Malicious PDF — malware analysis report

Static analysis result for SHA-256 13bc52c53ae87e33…

MALICIOUS

PDF

81.0 KB Created: 2021-05-29 16:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: dae6f24f3abba8a858ff18f7cbfac9e3 SHA-1: 59cb5c5dadff35053b122716f3835d24d8b70130 SHA-256: 13bc52c53ae87e33f641a0928178a3a8fc0d351138ad83953bdffd6648d23d88
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious websites. ClamAV and ML classifiers identified the file as malicious, specifically a phishing trojan. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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.
  • 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=2020+gmc+terrain+elevation+edition+reviews PDF link annotation
    • https://vomizovuzib.weebly.com/uploads/1/3/1/6/131637161/nelefe-zotupobivovuruf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367680/normal_604b3af5e1ebc.pdfIn PDF document text
    • https://nabokopawupanav.weebly.com/uploads/1/3/0/7/130739772/5d8899.pdfIn PDF document text
    • https://vokudaminovisuz.weebly.com/uploads/1/3/4/4/134495340/dapekolemimiz-zasuxa.pdfIn PDF document text
    • https://wijuzibodeba.weebly.com/uploads/1/3/0/7/130738798/3538604.pdfIn PDF document text
    • https://tifogufa.weebly.com/uploads/1/3/1/6/131637606/wakadovunadab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417990/normal_60064f97aa266.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371509/normal_60001f3e200d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388825/normal_5fcedc591d7dc.pdfIn PDF document text
    • https://nusomosuguxapo.weebly.com/uploads/1/3/4/6/134693055/joneta.pdfIn PDF document text
    • https://katibaluzopoxu.weebly.com/uploads/1/3/0/7/130738884/modum.pdfIn PDF document text
    • https://nidozasa.weebly.com/uploads/1/3/4/6/134680612/sudeten.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392453/normal_606bd5db5977e.pdfIn PDF document text
    • https://vapatukubarokul.weebly.com/uploads/1/3/0/7/130739856/3672996.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/68f49d3b-ebd3-4ca1-936d-aabbf5ecbde9/kovuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68816af4-c7d5-4b43-98b5-d58653357b6b/vepid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40903a4e-a599-41ff-bc4f-dbb76e866da5/bazigikabovanamajeka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4911458-35db-40dc-a78a-7695c5032fed/fagodobonosubetilosotof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9809157d-d519-4273-b9a4-fc9282bf106c/xixerimibowerilujawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43995884-525c-414c-8e4f-e1ec16432dcc/mop_pvp_vendors_horde.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e82f2049-c3c8-4b3d-8756-95ea34e3345f/what_is_news_reportage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6bc4639-33d3-4b35-8dbb-30b97204dc82/71317838264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c5f80fb-b6dc-46bb-a1bf-e7478ddd86b0/whirlpool_refrigerator_repair_service_in_trivandrum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea1741b9-c88c-44c2-905e-7d1e292a3120/lesson_5-4_the_triangle_midsegment_theorem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d455b715-f527-4479-a123-fe494f0b9fd1/78383895650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b63cd41-379c-45bd-9102-d78d3b7a0247/evinrude_etec_service_kit_uk.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_off0000fb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB96 5588 bytes
SHA-256: 17b022aa2b79ce992d9b317f96e060370c61472096637cfe20599353cd287b5f
font_01_sfnt_off00010e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E95 11076 bytes
SHA-256: c7dd22b3be129411714a67df4538f620846b196858df82c4f1bee8b07b26880d

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