Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d6bc5d47e21f612…

MALICIOUS

PDF

141.2 KB Created: 2021-03-18 17:50:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4a0fee39c40f871767d0df9e036152d SHA-1: 64274badf099fb9e27597404075753bacbd43223 SHA-256: 9d6bc5d47e21f61220e726a486ee72f803684709c090631ff256faf2c427e263
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, with the heuristic 'PDF_SEO_LINK_FARM' specifically identifying a link farm pointing to a PDF hosted on 'aarbuz.space'. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt, likely using the document as a lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://golowaki.ru/wix?keyword=manual+de+soldadura+senati
    • http://aarbuz.space/golds_gym_xrs_50_exercise_guideqx10r.pdf
    • https://static.s123-cdn-static.com/uploads/4366405/normal_5ff163e8ae05e.pdf
    • http://balifruit.com/4295065697e90n7.pdf
    • https://cdn.sqhk.co/nilajinipur/hiji8J3/fisco_agenda_2019_descarga_gratis.pdf
    • https://static.s123-cdn-static.com/uploads/4450721/normal_5fcc379a3e859.pdf
    • https://cdn-cms.f-static.net/uploads/4383475/normal_601377fdd72f6.pdf
    • https://pexigupor.weebly.com/uploads/1/3/4/9/134901766/1caedb.pdf
    • https://togimapobeno.weebly.com/uploads/1/3/4/6/134649298/refuvamemesuzarixuz.pdf
    • https://wezawemexa.weebly.com/uploads/1/3/1/4/131410399/lemub_vilot_dipilegom_xowozojuronol.pdf
    • http://help-ruleviolation.com/hallelujah_leonard_cohen_violin_sheendosr.pdf
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/jedorepademubiz.pdf
    • http://umkatrade.ru/hess_law_feoscogfesco2grr3qe.pdf
    • https://cdn-cms.f-static.net/uploads/4407084/normal_6017a51f962eb.pdf
    • https://cdn.sqhk.co/xurajalijok/7jgfS0O/vimajuxivuxolarif.pdf
    • https://cdn-cms.f-static.net/uploads/4473340/normal_6018d929d06f3.pdf
    • https://vexakoloninabi.weebly.com/uploads/1/3/4/8/134851928/4f15da201823939.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_c424957906d4421698b2196b7bee8a17.pdf?index=true
    • https://uploads.strikinglycdn.com/files/87f91920-ee5b-4e93-b210-aa76d200ae09/what_is_the_difference_between_excretory_products.pdf
    • https://uploads.strikinglycdn.com/files/3d285269-4710-4996-9908-0cc83f5f4029/rikidedejug.pdf
    • https://1160a196-6e18-49bd-931c-438029629b47.filesusr.com/ugd/40338c_c87d199481de44d2829b11750d7111f2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ed405cf4-f13e-4cd6-a94b-13ecb98829c4/27445655743.pdf
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_18ab8b5be00f44fb8b270b62cae5efdf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/709f5961-56fc-46ca-b1c1-e93099d359a1/como_agua_para_chocolate_chapter_2_summary.pdf
    • https://uploads.strikinglycdn.com/files/d1ae3bae-f242-49a3-b22a-42b63609a7fa/41416146226.pdf
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_aa9a6a3524c04901aa9174861c3bb2f3.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_off0001ec72.bin
a0430dcfe662d14f234f5493b028e0e468f2be382bbc630bce4330a7346b91bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC72 4824 bytes
font_01_sfnt_off0001fcef.bin
a7b246928aec6b5fc27dd290db015864d33e6ce96ce34cbdd15db21f5b4c4c5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FCEF 12936 bytes

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