Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b19285c483704b…

MALICIOUS

PDF

103.0 KB Created: 2021-03-01 23:25:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fe41900254df7e5094c463779e342d4e SHA-1: 7735d187f1e9e03871a8f67d24cd1bee387ca8be SHA-256: d4b19285c483704b575ce2b9a1d26e8485c70ab795571bf821b521ac85dbb11d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One prominent URL, 'https://dugedepap.ru/award?keyword=sig+sauer+p226+rx+holster', indicates a lure related to a specific product. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://dugedepap.ru/award?keyword=sig+sauer+p226+rx+holster PDF link annotation
    • https://jokuduzasaru.weebly.com/uploads/1/3/1/3/131381103/089b6e9a8fdf772.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/15958451242.pdfIn PDF document text
    • http://tiluvopira.medianewsonline.com/bandcamp_mp3_320_downloader.pdfIn PDF document text
    • https://naluzakagowu.weebly.com/uploads/1/3/1/4/131411806/loxawewitadovezakut.pdfIn PDF document text
    • https://xaredeni.weebly.com/uploads/1/3/1/8/131871979/xovowuxozejizud-sonukonu.pdfIn PDF document text
    • https://gutamunimidujad.weebly.com/uploads/1/3/4/6/134667749/6515354.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/kumewevaze_dedugotamodegu.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/96008875035.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/bojigaxab.pdfIn PDF document text
    • http://povulofi.mywebcommunity.org/31527945099.pdfIn PDF document text
    • https://lofusomibebez.weebly.com/uploads/1/3/2/7/132740423/c93a60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zisukuvi.atwebpages.com/libro_de_fsica_de_cuarto_ao_de_secundaria.pdfIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/vutop.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/terewigozodamejaduvube.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15496 5540 bytes
SHA-256: fc825742d673a24980d762c8d930bb91739e948cb3db0a6e26d22370cd386e7f
font_01_sfnt_off0001676c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1676C 11736 bytes
SHA-256: c3102ebb7cc8c55ef7adacaf12e2ec3dba33e853e286d23b31f67056e1cff7a7

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