Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd090e4734838ba…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 07:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 085883b8825066fbd270d30aed95868b SHA-1: d14880616dab6e81c799cdea519a1ad6cd8eae42 SHA-256: 4bd090e4734838baaa674ffd7eb19fd0eb6eb42e3c690ccb8a80689fffc88f1b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by multiple heuristics, including ML classification and ClamAV, as malicious and phishing-related. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The PDF structure and embedded content suggest an attempt to lure users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=canelo+fight+tonight+live PDF link annotation
    • http://misr-consult.com/userfiles/file/nanomutumat.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/sakokepujurevobume.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/45411741283.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/supubilujikop.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/patojupopuzinosiligux.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/nuzorizajalogovamu.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/faxetugesibag.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145036d19e54---geveda.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/5363854390.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396b3a8690c---nunuvijomisukilerejo.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/xetibaperajuzixugarudu.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/jagofu.pdfIn PDF document text
    • http://allier-genealogie.org/File:/55205864717.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/19560400601.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/77527021941.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/wuvabalasoxanekaresegawa.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/21337864722.pdfIn PDF document text
    • http://okvin.org/userfiles/file/zitetadimogebuzanabuni.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/24361416293.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/58700956105.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/86132924540.pdfIn PDF document text
    • https://renetravel.ro/images/files/76057799212.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///lajekodekuxosizekep.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210903033437.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_off0000d925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD925 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 10324 bytes
SHA-256: 68f228689323e4bb8f3964c7f44b91c89124b347e75e30d98022f63c41917837
font_02_sfnt_off00010875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10875 17600 bytes
SHA-256: bb0f23b85fab821192379d1239e167fc68a629e291fd7ce232f0dd94c73dc567

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