Malicious PDF — malware analysis report

Static analysis result for SHA-256 98804e80aef661f9…

MALICIOUS

PDF

81.2 KB Created: 2021-06-03 15:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bbba2a70b263758cfa555672a20e32a5 SHA-1: 56a29143b2293815f4b807b01bf2c8c8de891d37 SHA-256: 98804e80aef661f9a9facca9c30da301677b5da9b73544a6e12145317b1a68cd
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains numerous embedded URLs, many of which point to link farms hosted on disposable domains, suggesting a tactic to obscure the ultimate destination. The primary URL, 'https://medvor.ru/pbw?utm_term=age+of+empires+2+gold+edition+no+cd+crack', indicates a lure for cracked software. The ML classifier strongly flagged this PDF as malicious, and the structure aligns with a malicious link farm used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://medvor.ru/pbw?utm_term=age+of+empires+2+gold+edition+no+cd+crack PDF link annotation
    • https://wupibivuvofat.weebly.com/uploads/1/3/1/1/131164023/dozipipi.pdfIn PDF document text
    • https://jibizixowaxen.weebly.com/uploads/1/3/5/2/135296653/7129323.pdfIn PDF document text
    • https://nefipuximejax.weebly.com/uploads/1/3/2/6/132696351/c27891b0ec5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477408/normal_60208e90f3afd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464532/normal_5fec1c7a0a2c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368742/normal_5fc9c962274dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417662/normal_5ff2bef4409c1.pdfIn PDF document text
    • https://mezikemopirexat.weebly.com/uploads/1/3/5/9/135993778/dde401f.pdfIn PDF document text
    • https://bufasadapigeze.weebly.com/uploads/1/3/4/3/134307931/4c45661a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mapijakemifo.pbworks.com/f/context_clues_worksheet_7th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/547571dc-2944-4e64-90a4-dfa4870f233a/whos_afraid_of_virginia_woolf_character_analysis.pdfIn PDF document text
    • http://wojipag.pbworks.com/w/file/fetch/144423747/roropafifawokubawowoxi.pdfIn PDF document text
    • http://gijorugisaw.pbworks.com/w/file/fetch/144512982/71634400551.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb23c7ab-ccd5-4d4e-a085-dc64bcbeacc7/83451683238.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/gattaca_movie_questions_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/945d52ca-d695-498f-8b8a-65fb6260232a/starcraft_cheats_remastered.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d77d7d0a-b17f-4657-aa03-2488307d1a66/82034829988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c319958f-2c6b-4a56-9f46-3bfa083bee87/what_is_the_difference_between_food_chain_and_food_web_class_10.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/pobesaxezobokabixeromu.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_off0000fcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDD 5660 bytes
SHA-256: d0b049095b7e6fb99c5f719ee877e36cb0c94b6d1221e9b706edcd6d3de1ddd1
font_01_sfnt_off00011015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11015 12120 bytes
SHA-256: 8703a1bfb00e2300ada84484f8020d8958d6b31980714e034724028e1ef8d5f4

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