Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a7ed46c464db42…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 23:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8bb0d640ae645c3c62bb0db81e5ff73d SHA-1: 58ccd8e0c280f4a12c261b2b394d2eebf3f12155 SHA-256: 61a7ed46c464db4233d69911228e139923cc9405528cf4a19143fb0438f5ff13
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, many of which are part of a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious sites. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pistant.ru/uplcv?utm_term=pixaloop+app+download+apk PDF link annotation
    • http://pfmconsulting.org/survey/userfiles/files/kelekolatudosamodir.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/61134751727.pdfIn PDF document text
    • https://renewone.de/files/kumoredukekitut.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/27607195141.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/nujevilivudadonivi.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/64682879650.pdfIn PDF document text
    • http://ore-processing.ru/d/files/78731679483.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/85716410683.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/10168850451.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/22320814061.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/93b0fd3805c39ca6cd7435af08fe7fbc/90005919599.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/73915792060.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/kelimi.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210916231424.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/44024468859.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/37459852103.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/37669854824.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/duzurizagafuwa.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/jerilojibij.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/71295074045.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/49753600412.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/tikumidomulujunuwajumazof.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_off0000db9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9F 17724 bytes
SHA-256: a4af65af8e8e5d5e29485c453ed1b720f80049d7c7e9756e8e1eadd5fbd08310
font_01_sfnt_off000108af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 10168 bytes
SHA-256: 28e3eef78b50c320019e22206242e659c790d3658ae8bd10c4f3736e41c2eea7
font_02_sfnt_off00011f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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