Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67df59f54419739…

MALICIOUS

PDF

68.1 KB Created: 2021-09-16 20:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c4e5dc49bf204bb9120135746b4b14b0 SHA-1: 720f5f02f90186542b365694996095549d39921e SHA-256: f67df59f544197394ffefcf4cd504b0736b2bade73ad9936971c6dbb2b96981c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://infrive.ru/uplcv?utm_term=android+10+install+download PDF link annotation
    • http://clarksville.net/wysiwygfiles/file/14161516105.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/2445907203.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/vsa4etokut3gjjh20aiao8esjb/dutunorudejuwijame.pdfIn PDF document text
    • http://atek-ent.com/upload/file/lagubiw.pdfIn PDF document text
    • https://pellevah.com/upload/files/nepopefuxuvesi.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/xawozapezimovebamumali.pdfIn PDF document text
    • http://elitvorota.ru/f/file/lomegunekaxejoxawep.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/xavizibiregidunobavo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2f85c42cf---komagozupipopizalodubagi.pdfIn PDF document text
    • https://bunianco.com/other_files/File/89140548195.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-14/20210914182216943886.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/xunazusesokudaxirukefazak.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/31865096879.pdfIn PDF document text
    • http://grandfiltr.com/files/file/joxopiralanonulozutaw.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/budadenuvinawefetipur.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/22886349084.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/lipetilul.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/resujowadusinezaxip.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/bujosovazebigibatotawi.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/xigasimapug.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/wozepanijej.pdfIn PDF document text
    • http://lobi.md/userfiles/file/jekiwi.pdfIn PDF document text
    • http://retailcop.ca/files/fomerebevevepovajak.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/mimawirop.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_off0000af70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF70 14448 bytes
SHA-256: 100a02d6fe07d9b67f0f67d63d7818ec073422ab144bd97bacf68c9fb993a897
font_01_sfnt_off0000d364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7B 10348 bytes
SHA-256: 427f9ce34dcbcf9271225c68e990430c4b4ed957f81fa4913a89819ffe440c98

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