Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ab7cc75aa5e805…

MALICIOUS

PDF

67.9 KB Created: 2021-09-14 13:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4e0236af96af48c58322ebab94dc68ef SHA-1: 14f73870b88f783659c96b894c15f12ac6a2cf64 SHA-256: d7ab7cc75aa5e805220dbec83bb922fcaf2f684d49ab64a9d72e25e0f4f3a8ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, embedding a large number of URLs, many of which are disguised as file downloads. This pattern is consistent with phishing or malware distribution campaigns aiming to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/21089756143.pdf In PDF document text
    • http://changrung.com/ckfinder/userfiles/files/panimurirube.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109041256306423.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/61245600496.pdfIn PDF document text
    • https://hiroyoung.com/data/files/somedivazozinekuzuz.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/gojogawelekiboluzi.pdfIn PDF document text
    • http://markone-tools.com/upload/files/nosagese.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/2852791020.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/89309426573.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138891f22725---galazadafizolubad.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/zedabefezulixag.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/80696092935.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e1d8b2ff5---wevexusotiboseduj.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/momufomefegolezajuvudov.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/46490698185.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/94686569400.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/5408271267.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/wanigijutojutibosamiva.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/79561295102.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/negavofodexewedoza.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///tivulazewole.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/lojilirobovilomugodumubuz.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/90487007112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=tiny+troopers+2+mod+apk+unlimited+moneyPDF link annotation
    • 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://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_off0000b00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC822 10940 bytes
SHA-256: 50f6279e6c7189f80d02e8f5ef93ac911eff5d3edb583da19da2a32890ac7891
font_02_sfnt_off0000e196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 14832 bytes
SHA-256: 11befbb7d429055996dadc2f0fcc7f2360fa24c9a980ebf04725cad610cafcf5

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