Malicious PDF — malware analysis report

Static analysis result for SHA-256 1384e655a652777c…

MALICIOUS

PDF

92.3 KB Created: 2021-09-19 03:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 954de7e82d9f403e8c4e5f8cd3ca2056 SHA-1: 71754c9af46318d61584b996333feb783f1f9a24 SHA-256: 1384e655a652777c4d96a6e3ff3e1d941c6b5d7cd41912470e1f1d594ee5a37a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious attempt to distribute malware or phish users. The ML classifier and ClamAV detection further confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://catamma.ru/uplcv?utm_term=free+recent+movies+online PDF link annotation
    • http://shrlie.com/upload_fck/file/2021-9-19/20210919021433162097.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/7gfc84kl3c69d0hfhvt2uabb92/logikoguvuvagekarowadud.pdfIn PDF document text
    • https://pratham.one/file/mazajuvixezamuraruzoti.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/20219161834452259.pdfIn PDF document text
    • http://halmar.info/userfiles/file/15493039034.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/29884817540.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/nujawavi.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/dugotizixoxeweluwulalu.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/nurogitujexivemapi.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/44571854516.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/rukaputojezuloni.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/33360538070.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/47207321523.pdfIn PDF document text
    • http://abc-tel.ru/data/File/dekoj.pdfIn PDF document text
    • https://pixel.bg/img/file/18939892744.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/61804353707.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/zevelexow.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/rigaxurosogutot.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/bovuzipagowenomigekumo.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f97cd4ec18015360f7017b415ec62c65/38258827778.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/7687381905.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/28545548254.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/84775371256.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/biluwefudaz.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/xowar.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/runikoli.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_off00010714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10714 17440 bytes
SHA-256: 88056cb00092241a80c18420293fea3a77fff7958157de64c945ed72aabaf7d5
font_01_sfnt_off00013433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4A 10272 bytes
SHA-256: 6df6a335aa53048ba2bd2ca68c73d357d5882d067bf3cb798f21185b6baf2f3c

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