Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e85da82e62d642…

MALICIOUS

PDF

91.1 KB Created: 2021-09-21 07:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c50a7d19f9c61c18ab410a004554098 SHA-1: aac39f186ce076852fcfc61f5f9c2171a9c541cd SHA-256: 41e85da82e62d6428deca1a2d3915129d3a0e0df4e2985772f708b373132d579
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 and disposable hosting, indicating a likely attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links, characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://crewmak.ru/uplcv?utm_term=hangouts+dark+mode+apk PDF link annotation
    • http://novena99.com/uploads/files/202109162256581330.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/binojotubasopefuw.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/40872507320.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/89831802845.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366b3166128---347908953.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/50093063491.pdfIn PDF document text
    • https://norservis.info/files/files/sedutesubekadowaxapirazut.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/tudavige.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/17488822063.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68419104462.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/pukipoxokerebuwis.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/mevelogakapoboxuruwupe.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/welevikawokoroxuro.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1631528628718770076.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/kizutubonu.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/21568479958.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/raveketisikokewanoju.pdfIn PDF document text
    • https://dm288.rs/slicice/file/kagut.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/98279531212.pdfIn PDF document text
    • http://linker-apps.com/files/xadelofasawuk.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/11485866639.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/gokodide.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/rosekebotozedededukutuk.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/sp5rpkjah884taeorcqqfbcf92/dekuragebomipagijolu.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_off0000ee19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE19 24868 bytes
SHA-256: 04f40efdf47bfe24018b6ea0c72d2fbd27e4af867785faba3f72839de6bd69e2
font_01_sfnt_off00012c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C55 10780 bytes
SHA-256: 250f0ea5036dc19f390d38b0b48123f3ac3bd2a4905eac54a2a7cc54b9f08ecb
font_02_sfnt_off000144f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1