Malicious PDF — malware analysis report

Static analysis result for SHA-256 b29c0f307db56f3a…

MALICIOUS

PDF

78.4 KB Created: 2021-03-10 18:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1874c1663774f6eefab0e7b5d22bf46d SHA-1: e41a30198d6d2785f6f8dab366f5b31b03e864d0 SHA-256: b29c0f307db56f3a1173311d61f0733b86999589d6a7e08fa7012f6dac9bf3da
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a link farm and ClamAV detection as a phishing trojan. The embedded URLs and the PDF structure suggest an attempt to redirect users to potentially malicious sites for SEO manipulation or further payload delivery. No scripts were extracted, but the PDF's nature strongly indicates a malicious intent to lead users to external content.

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=wowwee+light+strike+discontinued
    • https://cdn.sqhk.co/mepowokugo/Cia4ijR/72872646991.pdf
    • https://cdn.sqhk.co/juwafajem/jsYjgM9/91789308130.pdf
    • https://cdn.sqhk.co/kulizuxekume/jAhj9QP/nuwikawepowufepamo.pdf
    • https://cdn.sqhk.co/zezinojox/jeUiS1Q/xagojurobegu.pdf
    • http://taforojujutusig.mygamesonline.org/nixanumepuberewafo.pdf
    • https://referozudu.weebly.com/uploads/1/3/0/7/130775612/gevifeto_rojela.pdf
    • https://virenejamavik.weebly.com/uploads/1/3/4/1/134131854/9707741.pdf
    • http://wozekozexufoxol.scienceontheweb.net/game_of_thrones_book_1_published_date.pdf
    • http://fopokigife.mywebcommunity.org/landforms_worksheet_class_2.pdf
    • https://kivepuwepadile.weebly.com/uploads/1/3/4/3/134392404/wusatukitab.pdf
    • http://zijafanovidiz.sportsontheweb.net/dijonifewosapu.pdf
    • http://pawomodom.medianewsonline.com/zukilaximexeluwog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3a1b6661-048b-4f09-ad9c-4d61eec4fea0/32373054728.pdf
    • https://s3.amazonaws.com/besafefaf/68909113192.pdf
    • http://pefimubis.myartsonline.com/tixed.pdf
    • https://s3.amazonaws.com/jitimesolagun/81519063561.pdf
    • http://bekusisit.atwebpages.com/el_pollo_loco_tostada_salad_calories.pdf
    • https://s3.amazonaws.com/jakujakula/kedimawasuteraruzel.pdf
    • https://uploads.strikinglycdn.com/files/e98494a2-dd3c-425f-b3c9-e55b9dacbd88/modernist_cuisine_at_home_deutsch.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_off0000f5b6.bin
ad153211561783c0a1c9bea44d3aa5a717410742ec20e611e27ff08d17db683d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 5160 bytes
font_01_sfnt_off0001075a.bin
807e9e4b067a604242d33ce91ac8980cf4a8adcceac3f7578d029c7e74f26485		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1075A 10896 bytes

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