Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa163abb076e48ba…

MALICIOUS

PDF

98.1 KB Created: 2021-03-23 16:45:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfecc5c70a0cf73d2fbd3144a8df146d SHA-1: 92de1f190f0510d0a8b2890e6cb63ed1606c4ae3 SHA-256: aa163abb076e48ba11e5b8389198eb8994c57710484ae1d58eae1d53f43c7585
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The primary URL, 'https://resalured.ru/wix?keyword=adventure+quest+max+stats', suggests a potential phishing or SEO manipulation scheme. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution via the linked PDFs.

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://resalured.ru/wix?keyword=adventure+quest+max+stats
    • https://cdn-cms.f-static.net/uploads/4411231/normal_6041b10db6784.pdf
    • https://cdn.sqhk.co/rabataxuvax/ggjbiid/politics_and_the_english_language_reading_questions.pdf
    • https://cdn.sqhk.co/jojevirelo/hcbjige/wineg.pdf
    • https://cdn.sqhk.co/seseniluvus/gg6gihh/rudodulukinakasuwuxix.pdf
    • https://cdn.sqhk.co/tezofugowura/jeEPhjX/59610977746.pdf
    • https://cdn.sqhk.co/dixejetafap/Qiifnzp/sword_art_online_fatal_bullet_game_review.pdf
    • https://cdn.sqhk.co/zedugixaka/eieghgj/98810133977.pdf
    • https://cdn.sqhk.co/kisoxukapab/Ogigcge/bloons_tower_defense_5_apk_hacked.pdf
    • https://pobikutilun.weebly.com/uploads/1/3/4/8/134871216/wular.pdf
    • http://good-production17.site/55994588141wf8om.pdf
    • https://wezifujizofuji.weebly.com/uploads/1/3/4/9/134904593/3acfda611fdc.pdf
    • https://cdn-cms.f-static.net/uploads/4464869/normal_5fd33bf61fb99.pdf
    • https://vasaxufunibax.weebly.com/uploads/1/3/1/6/131606743/kupubejapusuni.pdf
    • http://ig-socialmedia.xyz/66206390505wbs80.pdf
    • https://cdn-cms.f-static.net/uploads/4481154/normal_603774a9c1fe5.pdf
    • https://torolanomopefi.weebly.com/uploads/1/3/0/7/130739669/potababa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/51361cd6-747f-4d92-bcf8-0e0d48442f2b/bemotozadekixadivebo.pdf
    • https://uploads.strikinglycdn.com/files/f39b866a-a82c-49a9-9273-711915d967dd/subumisejeginefelazanus.pdf
    • https://uploads.strikinglycdn.com/files/bad040b3-f6b3-4192-8a70-ce1ab85964ef/can_you_still_get_black_ice_skins_2020.pdf
    • https://uploads.strikinglycdn.com/files/450f4222-8aa6-4865-b4ef-0bdb50b15fb4/fewazu.pdf
    • 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_off000142b2.bin
8115d59b5edf2b3fddafb4c42ab4489123481b6d904b154396bf42415b1ce3cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142B2 5184 bytes
font_01_sfnt_off00015440.bin
6a2ba3718743e73c261f0e6a890cd665992787b64f8d8a91a21d54833b2e7ed5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15440 11464 bytes

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