Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d082eae9c8801b…

MALICIOUS

PDF

77.3 KB Created: 2021-03-13 17:13:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb8ebe0fbc3906748ae62e3b71fd47c3 SHA-1: 924b48f16e0aabaab3d9b19a02aecf26c82cc93a SHA-256: 44d082eae9c8801bbceea74efa0ba8243e8ae044f134259bf8ec215c39c6bf1e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings for malicious content. The document body, though heavily obfuscated, suggests a lure related to a worksheet, which is a common tactic for phishing or malware distribution. The presence of embedded URLs indicates an attempt to redirect the user to potentially harmful external sites.

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://druttle.ru/wix?keyword=water+the+universal+solvent+worksheet
    • https://cdn.sqhk.co/badaxiloru/eicKigK/perfect_scoop_coffee_ice_cream.pdf
    • https://vamolitewule.weebly.com/uploads/1/3/4/6/134670516/2085987.pdf
    • http://flowerport.shop/distributed_systems_principles_and_paradigms_pptpoxb9.pdf
    • https://cdn.sqhk.co/dejojoduzi/ihiihSq/brave_frontier_characters_ranking.pdf
    • https://cdn.sqhk.co/devisojop/Jhisbia/kogosaliwowefudupetetidu.pdf
    • https://cdn.sqhk.co/famagafe/jiUQeig/55318611133.pdf
    • https://cdn.sqhk.co/ravuviwidi/igjc7hb/wexurevumexuzubavumonok.pdf
    • https://bakofusu.weebly.com/uploads/1/3/2/3/132303024/6122378.pdf
    • https://cdn.sqhk.co/sugumujozik/dhglhgX/59456428150.pdf
    • https://cdn.sqhk.co/fuvopone/hYWNXB5/nutekoduxabukama.pdf
    • https://jibizixowaxen.weebly.com/uploads/1/3/5/2/135296653/metuj.pdf
    • https://cdn.sqhk.co/pifonode/XAhihiK/antalya_opera_ve_bale_bilet_al.pdf
    • https://gevamimukeruku.weebly.com/uploads/1/3/4/6/134656740/jopavupesilurafusa.pdf
    • https://cdn.sqhk.co/jonawepatem/c7heWo0/73359855817.pdf
    • http://dkblogin-de.com/petsafe_bark_collar_not_working2fqrv.pdf
    • https://devuxitimon.weebly.com/uploads/1/3/4/5/134596282/gawerex-mugone-paxovegija.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_3e0fcd083f594f97ad88dbfbc83582f2.pdf?index=true
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_8d2ed9bf3464430ba8b8828f12b4853b.pdf?index=true
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_472efdb123a049ed9b1226d2e720d618.pdf?index=true
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_f732974bfb744230a80132682c5f3a3d.pdf?index=true
    • 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_off0000f068.bin
acb1efe27c30be25d7650d3c253920b471a70d778e44ba428f3be72e7217ec73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 5004 bytes
font_01_sfnt_off0001017c.bin
7cb47b2562abf35b357e4453cbc9777e58a31b5dcfecfe5dfc06e8f0a25f789f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 11536 bytes

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