Malicious PDF — malware analysis report

Static analysis result for SHA-256 883b753565243743…

MALICIOUS

PDF

85.3 KB Created: 2021-04-18 11:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 248f2da0d4d4f7ab5358650c7309b0da SHA-1: 21eaf767a12b2ba918f4cdee3105b18a8bc70ae5 SHA-256: 883b7535652437436b133d6dfcbd296cd916ed5f513c33b3bdc45134b4a621ec
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristics point towards an attack pattern involving directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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://botokaw.ru/strik?utm_term=molecular+cloning+a+laboratory+manual+%2528fourth+edition%2529
    • http://usesucre.pro/club_car_onward_speed_upgrade_gasntxri.pdf
    • http://thecet.xyz/tufunekeremrydvj.pdf
    • http://chempion.coffee/ea_koetting_agen9whb.pdf
    • https://cdn-cms.f-static.net/uploads/4412174/normal_602492b78b67c.pdf
    • http://lazadacostumercenter.com/80900013051qxz.pdf
    • http://support-copyrighthelpservice-about.com/grokking_deep_reinforcement_learning_githubgldcl.pdf
    • https://cdn-cms.f-static.net/uploads/4491965/normal_601d85ff5b724.pdf
    • http://wei-nmvc.com/fragmentary_order_template8z9na.pdf
    • https://cdn-cms.f-static.net/uploads/4379974/normal_600cb474a3d3a.pdf
    • http://m-ryanaf.site/bosabozonvjlhj.pdf
    • https://cdn-cms.f-static.net/uploads/4471691/normal_601ed6a4099e8.pdf
    • http://gagarinski.su/18366737989ilesi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rugunazivesix.rf.gd/destination_b1_online.pdf
    • https://s3.amazonaws.com/tafogusegabomu/what_are_the_characteristics_of_realism_in_cinema.pdf
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_b4c4718162864e7087e2737cf8deab8a.pdf?index=true
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_039ec19b0deb49148398cfcc7675a3e2.pdf?index=true
    • https://s3.amazonaws.com/pubopelej/fox_2_channel_guide.pdf
    • https://s3.amazonaws.com/xufaxoferugod/69911501117.pdf
    • http://wobagelamabix.rf.gd/what_is_a_ssa_1099_form_look_like.pdf
    • https://s3.amazonaws.com/wuzalugiseto/66524689373.pdf
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_c607c91a0b7d470baaf427053018cb89.pdf?index=true
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_a9785d2929264a30882cd585d2629ef5.pdf?index=true
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_3ecf725f2f134e6e9ddcff1a7bfcb238.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_off00010e91.bin
a6b5f7d241bf262bdb5b1a4c0803654f392eeb432c723eeeb09d9c6b864b52ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E91 5656 bytes
font_01_sfnt_off000121cd.bin
a63bbe44b99360cbe3f8395e60c512d2408fb8a6220443cd5ed1e9ca7b9dfa36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121CD 10988 bytes

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