Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44c2c4d865ce06d…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 10:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 63c0e07c72abeeaf983f7db79882d519 SHA-1: 1e64ab235d5387b807c1f158ac9f6141247b8fd8 SHA-256: c44c2c4d865ce06d67bbdcee2baba6cf3d57f2592849ba99c063140eee992294
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many pointing to disposable hosting and using UTM parameters, strongly suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=how+to+flash+samsung+stock+rom+using+odin PDF link annotation
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96047169885.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161393549db273---57789825481.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/binid.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/4133209045.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/86282557331.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/bokabisasuje.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/44099703822.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/nukolidulelububekamojegi.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/murodajefubezeboso.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/kegivi.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/53353305990.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/28689195189.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/lilizuxorimagimojugujajaw.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/sekerijegitefobusasiwume.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/lkp4tu7ur1cjn3mvi9fg8nguc6/ziwokogebovin.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/62405701438.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/levivaf.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/rezilubijefod.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/zajofefifewagafigeriba.pdfIn PDF document text
    • https://unaizahic.com/Files/files/57943681739.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/ferif.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210920_E816104545AA37A4.pdfIn PDF document text
    • http://cjatkinson.com/userimages/3061583875.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_off0000cf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF82 17692 bytes
SHA-256: 8136836125ec6530ec0590844c2d51e06a724ca6b3a1308547f4e5bfb2a10cbf
font_01_sfnt_off0000fd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11570 11060 bytes
SHA-256: d77d12a721086a9194d2e68ef30485d6ccb3e826762d0b9d81bbea91ab62aa58