Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc1d512712d5db9…

MALICIOUS

PDF

81.6 KB Created: 2021-02-05 23:09:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0000d2e02d996cfeca84006afbefcda1 SHA-1: d4891817be45500df4ae62c063502ab0440dac24 SHA-256: afc1d512712d5db9b26cb1558af9e27506fd5e807e8f6955a81d955c3f084428
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 pointing to PDF files, suggesting a link farm or SEO poisoning tactic. The primary external URI, 'https://leonvi.ru/wb?keyword=funny%20kid%20test%20answers%202018', indicates a lure to a website disguised as search results. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://leonvi.ru/wb?keyword=funny%20kid%20test%20answers%202018 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445320/normal_5ff3ec631d91a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454967/normal_5ff657a95ab25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409421/normal_5ffd54a7ed6bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443619/normal_60082bf08a805.pdfIn PDF document text
    • https://kigijogi.weebly.com/uploads/1/3/4/7/134702755/dotarubapex-loxetisoxutelek-nogutojotokoze-lekazigiwuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447888/normal_6001e2e27fa02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369900/normal_5fc59b923b119.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/cS5yggo/pimagerizuguwuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421218/normal_6010fe12b465f.pdfIn PDF document text
    • https://cdn.sqhk.co/jerusuxelek/bjfnQIv/game_circus_coin_dozer.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/nViixgi/77487961950.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392442/normal_5febb140e385c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469824/normal_5ffb6c2abb090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388169/normal_5fd8b6a75b677.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bixejefasi.epizy.com/sokizobufabugiwog.pdfIn PDF document text
    • http://litopuputorer.rf.gd/sikadoxikiravitizukuled.pdfIn PDF document text
    • http://disefubukub.rf.gd/xokoju.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D5 5292 bytes
SHA-256: 4f6ea52379f6188a712679ed4f6314ff1bdf14a0e2aa5dc6ccda674213f33931
font_01_sfnt_off000107ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EE 10284 bytes
SHA-256: 775be56572fec03915bbe5465e3f757e6df0fdcd7208eda6b146fa5c353ea501
font_02_sfnt_off00012af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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