Malicious PDF — malware analysis report

Static analysis result for SHA-256 a855a35a6287558f…

MALICIOUS

PDF

78.3 KB Created: 2021-09-20 05:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2b04870e9acd275c227d030a54e9ee18 SHA-1: 3e93264e3338df8aaba3e8486cd28d5b9485e324 SHA-256: a855a35a6287558f9a706750381ef70671a799724256418a286c46a6d9c0bd3a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://drafthe.ru/uplcv?utm_term=zlatan+cash+app PDF link annotation
    • https://studyhalltracker.com/files/file/loxunivawemo.pdfIn PDF document text
    • https://inks.bg/userfiles/file/85719532739.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/15960421163.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/34071022781.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161426dd6d5be4---wusikoji.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/jekuvimekose.pdfIn PDF document text
    • https://coevent.ru/upload/files/didin.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/42387569450.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/muluronenabe.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/33958453701.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/savagodal.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/solagawonitopagofamerit.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210915140513.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/rizafogiripezisolavakuwe.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/jawogulijidez.pdfIn PDF document text
    • http://deltools.com/userfiles/file/fulagebosusagovaxume.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/14682362728.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/nijegilak.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/93906356941.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/26864447645.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/88797886866.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/89453932640.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/pitumivozus.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/farowiveti.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/77568735967.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_off0000cd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD16 9988 bytes
SHA-256: f9e55a4ecf2a5a85afb05919a6f0737f0385c356feed95b83af9c00328bd4720
font_01_sfnt_off0000e32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32F 18604 bytes
SHA-256: 68e2e9f7c753fbf0efd973497e909214746e0c31eacdd879146a23221f41e191
font_02_sfnt_off000113ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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