Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b37b17aa5ad9c1…

MALICIOUS

PDF

87.9 KB Created: 2021-03-14 00:28:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a155d9e921e6e62a76888d9b6cf6f749 SHA-1: db8997612bc6ba08b5ebb193b6160c67b83f2f81 SHA-256: 34b37b17aa5ad9c111563da115098f10e48fddff89a7dc2d396b16eb96a859b0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. While no scripts were extracted, the PDF structure and the sheer volume of outbound links suggest a malicious intent, possibly to distribute malware or engage in phishing. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/wix?keyword=harry+potter+fan+art+funny
    • https://vekewofamir.weebly.com/uploads/1/3/4/1/134131384/4bb8eb0b1bf2b3.pdf
    • http://pokezokebawi.mygamesonline.org/heat_transfer_jp_holman_solution_manual.pdf
    • https://tesewipelevifiv.weebly.com/uploads/1/3/3/9/133997178/7498710.pdf
    • http://repair-monokoles.ru/59459341655mg1vm.pdf
    • http://wapadax.scienceontheweb.net/pisasazidozadowakarel.pdf
    • http://nadozigipak.22web.org/beats_studio_wireless_instructions.pdf
    • https://domepapelixubu.weebly.com/uploads/1/3/4/4/134400118/361c205514de.pdf
    • https://balolenitazir.weebly.com/uploads/1/3/1/0/131071159/kajunemitijodexuxu.pdf
    • https://momexifolel.weebly.com/uploads/1/3/4/3/134319719/e3a49.pdf
    • http://vsspb.ru/bujibebusisodadan7nk4.pdf
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/a4e341f5a2f08.pdf
    • https://mekumago.weebly.com/uploads/1/3/5/9/135981587/vapoluka.pdf
    • http://onlineeshop24.xyz/4145021915872y41.pdf
    • https://vawoxaju.weebly.com/uploads/1/3/1/3/131379227/gutemofima.pdf
    • http://aduo5.online/372238610863aou5.pdf
    • http://smartradiobf.ru/dawofa4asyy.pdf
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/ff3f3953c899.pdf
    • https://raputaluwim.weebly.com/uploads/1/3/1/6/131606275/jutozuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lixanixuzuki.rf.gd/brit_awards_2018_full_show.pdf
    • http://lizolubemerawi.epizy.com/wpf_combobox_template_popup.pdf
    • http://kegipufi.rf.gd/padoxolo.pdf
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_17de58b0c76f4b9892669fbecb1e3d50.pdf?index=true
    • https://6e21bb2a-7de5-448d-a189-2506d4971bd3.filesusr.com/ugd/f64db8_80470eef7c4347b99b3a7012c75ac6c9.pdf?index=true
    • http://laxuzoto.onlinewebshop.net/30457605566.pdf
    • http://taguminuligifis.rf.gd/30775568432.pdf
    • http://sagoralezerelo.onlinewebshop.net/80464651860.pdf
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_6950e5ba2ab94108a5df363f08db01ed.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_off00011c8c.bin
aedc759352da49c61b9b34693515bbd50c22fcd00e6f2a4ef8f672a13f45101f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8C 4748 bytes
font_01_sfnt_off00012ccc.bin
bedd3006b9194a89b134f9a144a979bf5539f81f0cacb367578cfd9bbd6cbf57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCC 10772 bytes

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