Malicious PDF — malware analysis report

Static analysis result for SHA-256 85eae57a958f6cc5…

MALICIOUS

PDF

78.1 KB Created: 2021-02-11 19:58:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 188197820599a1e238948f4aecd16fef SHA-1: 40ad5820eb7da369d05e2940b2a2c2cf2fa6cc1c SHA-256: 85eae57a958f6cc549941173ec856bd2ef78ed94e88c5b1f9b5dd09b8646dc94
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, and contains numerous external links, including a link farm heuristic. The document body, though partially corrupted, suggests a lure related to an IKEA manual, which is a common tactic for phishing or malware distribution. The presence of multiple external URLs indicates an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/wix?keyword=ikea+hemnes+bed+manual PDF link annotation
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/4375fc4fddd2704.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477863/normal_5ff44db478650.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://sajonagot.rf.gd/wozuvafotexu.pdfIn PDF document text
    • http://tijeluko.rf.gd/jujowetin.pdfIn PDF document text
    • http://makibiwediwanov.rf.gd/40269106131.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/bladestorm_nightmare_free.pdfIn PDF document text
    • http://xekababemaxukop.rf.gd/81744320086.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/benigna_definicion.pdfIn PDF document text
    • http://bajitak.epizy.com/51566817950.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/tadovirelolubowuwojawi.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/dragon_mod_for_minecraft_pe.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/3360921256.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/15954553666.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47E 4756 bytes
SHA-256: 99cf00506252583a7c43f0e6eb52f98a7bd71c92cd7018ec8ffc3ea20de6ff4f
font_01_sfnt_off0000e466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE466 10448 bytes
SHA-256: 414fb63466b9b7543faa29ed2427540ab5e000fcc8a172d7c299615c768a3cc0
font_02_sfnt_off00010864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10864 16172 bytes
SHA-256: 526177ef816c6165251276cba9d37c9cde58c758a098f93fabcc535992017e36
font_03_sfnt_off00011d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D81 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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