Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0bc2075a34edfe…

MALICIOUS

PDF

89.3 KB Created: 2021-09-24 09:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 267928e23c9d0d7632e56dbbbb542bbe SHA-1: e8013855083bd8b887658501cd7f214fd086be3d SHA-256: da0bc2075a34edfe367761e6b89f03b1d353b9c1bbffc008b0b89f4a065da3dc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable hosting. The document also contains lures related to remote support tools, suggesting an attempt to trick the user into executing a malicious payload disguised as legitimate software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pixomot.ru/uplcv?utm_term=use+laptop+keyboard+on+android+usb PDF link annotation
    • http://debnine.net/UserFiles/File/xukemopuninameputubugim.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210910121234.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/koxubitodobuvivawadovoz.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/4544043644.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/depokigulugajat.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/43833900998.pdfIn PDF document text
    • http://www.moyekolodin.com/files/22129185730.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/xikavelozodojuwedo.pdfIn PDF document text
    • http://zeci.nl/im/image/77500753913.pdfIn PDF document text
    • http://christopherdallo.com/file/gajitemuwesosijizosu.pdfIn PDF document text
    • http://hybsch.it/upload/file/pipezafiguxani.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/fd9a619cfe95c1f0343240e7d5cf0411/20809568101.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/goxawa.pdfIn PDF document text
    • https://mcsfood.com/images/file/73335946426.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/pewinijixoduxavebilez.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/puruwarep.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/91525043599.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/dipeleturikitesutanuw.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/18873553410.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210910214910725.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/22848036539.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/10675930239.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_off0000f350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B62 19952 bytes
SHA-256: d87ac7ef5e145f14579007a33f30def8656ed6c520ce59ec144a414060a47733
font_02_sfnt_off00013ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF9 10840 bytes
SHA-256: cd148d29e3113f5a53b48b71b04b9cc9523f9a22ea7c010b20b22a26f12f2038

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