Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3719082413f545…

MALICIOUS

PDF

71.5 KB Created: 2021-09-28 10:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2bcd44b80a8c63613a2fdd7e5a87e68a SHA-1: e4e15cc501fff2018b5ce0487f173059c2fb924d SHA-256: ac3719082413f545b7ef5c8b40e8d3e96e7d8bdc7948d1ce0a1e056bf1fe2ffd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to link farms on disposable hosting, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate structure for hosting many links, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=mx+player+video+player+android PDF link annotation
    • https://kingcarmotorista.net/uploads/files/ratukobasofuvofokele.pdfIn PDF document text
    • http://fruitsad.pl/images/file/bolejazorubejemisasatur.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/gibokomezefewekem.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/matet.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/bogixolixupe.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/relodozavij.pdfIn PDF document text
    • http://bingsu.ir/cache/fck_files/file/56072994405.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/71998322369.pdfIn PDF document text
    • http://hongdacable.com/d/files/4934180936.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/sififid.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/zuwufipesukow.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/bipozuzel.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109271838372876.pdfIn PDF document text
    • http://fourfoods.com/images/files/79710025599.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/42578299932.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/10427449417.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/liredusikunuwozarovux.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210918_7E3EE6F037F6602D.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/kawekager.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/35c55564247a7e1dad9e8ab67b08dff1.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109131004169555.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/79131293755.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e740022de3---16720172627.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/dorekusamiki.pdfIn PDF document text
    • http://tulga.ru/editor/files/xijegewepebos.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDB 10392 bytes
SHA-256: 8306ad0431fc9680064a36639a26c1a9c4f83ddf2f4f8a965245d0a0842583ae
font_02_sfnt_off0000e476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE476 17416 bytes
SHA-256: 9781497ec534ce2888efd2ba35fe8378f00f7e3acfe7f11f08f4a7fd3ac8801c

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