Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94bb6aa1f6ec5eb…

MALICIOUS

PDF

86.5 KB Created: 2021-09-17 12:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8002ec7abab2644852ea16417a37c330 SHA-1: 644d373f9c5f3803265bcd02843747ca1d909561 SHA-256: b94bb6aa1f6ec5eb91165ed8ba6bdf7c3df0a13583655415a860a60159f0cec0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to disposable domains and acting as a link farm, suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and URI findings strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=anonymous+browser+android PDF link annotation
    • http://pointerboards.com/uploads/admin/files/99668863593.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/butulusizurijofafo.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/68702200.pdfIn PDF document text
    • https://ibextrail.com/editor-images/29803280306.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/33726232397.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/nidapogowusezojamafujutew.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/famodiwo.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/72837671866.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/77217320829.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/kilabemoxowemomapev.pdfIn PDF document text
    • https://pr-dienst.ch/file/14451195587.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365ebabe18f---55056678577.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/basorunutajazusuneju.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/15388067488.pdfIn PDF document text
    • https://soechi.net/userfiles/file/46682498887.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/6ae4161278f238c930d728fed234f414/5629098424.pdfIn PDF document text
    • http://domplus.su/userfiles/files/46531652984.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/xibudaguxikajobefu.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/vetow.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/lokizamefawugem.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/jekonalusafeso.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/zunorezuxuw.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/mujezosivakopovamog.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/27987701328.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/xonazusamaju.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_off0000eedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDC 17396 bytes
SHA-256: d250d16cd91957ab58bba6ca92b84a746e41d808db4b9b2f6c7026fdab29c005
font_01_sfnt_off00011bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13407 10688 bytes
SHA-256: f7b34024ab740b2d350b7e4469bcf087b49032f2405b1024a34e14bcf6c13995