Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e8f994cba3bb605…

MALICIOUS

PDF

72.6 KB Created: 2021-09-16 10:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 333e8bbf9306f2cc449889edc1ac124d SHA-1: 348c379196ef03b0295bc15a2cad64763ec31726 SHA-256: 0e8f994cba3bb60533d7d2f92d7f7e22a648057e892bdeda341723d02a847ff6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic analysis indicates it functions as a link farm, containing numerous external URIs pointing to disposable domains, likely to distribute further malicious content or conduct phishing. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pixomot.ru/uplcv?utm_term=filmorago+no+watermark+download PDF link annotation
    • http://aesg2edcv.handylover.com/upload/files/83137737180.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210911215036_583433966.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/gelosifelufewurepipovo.pdfIn PDF document text
    • http://travellerisland.com/files/jekugebuvalisabobuka.pdfIn PDF document text
    • http://langmypham.com/luutru/files/67897421077.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/84677562476.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/saxebinelusotimatizeje.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/xavuvujiwufitilixaf.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/saruvimujeniz.pdfIn PDF document text
    • https://artenika.pl/fck/file/sururivapaf.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/27856065927.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/vevefopojukegezorej.pdfIn PDF document text
    • https://edgecs.com/documents/75345221408.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/zopepef.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/zodijajunabubopedi.pdfIn PDF document text
    • http://labonscafe.com/userfiles/kinizak.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a818fdda46---lebexalevegusuginane.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/fogatebotajowawe.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/pixotovugoxowupa.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/riwepuguwobunopazekekafiv.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/fipirubibufadoxe.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210906045254_eph5yl.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_off0000bb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD331 10580 bytes
SHA-256: 1840ad7253279b8a216bb8091b41f64970489247619d27bda7bc322ba055bb82
font_02_sfnt_off0000eb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1B 16452 bytes
SHA-256: be22c4eaaa96fa91b24043744a121b936351ca5f256c3cd239ceb4b64e072ff1

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