Malicious PDF — malware analysis report

Static analysis result for SHA-256 67281159ae695695…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 09:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b9f0756ef3df6aa877fb9280a6d4c5be SHA-1: e4fad6ad4419dd88473d76e4ba65fe6a3eef7150 SHA-256: 67281159ae69569567eb1e7e2241f928d03dabe140775112d9dec9022e676e44
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. Multiple external URIs were extracted, suggesting an attempt to redirect users to potentially harmful websites. Although no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://allytemp.ru/uplcv?utm_term=use+phone+as+webcam PDF link annotation
    • https://gres-k.cat/userfiles/file/nakebuvurenigumaxoze.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/76629102747.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/faxunulagumal.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/zaviwerefaxatugidukuvi.pdfIn PDF document text
    • https://blokhol.com/upload/files/lalurojipodirozazinotu.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/wezelip.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/7330207774.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/19256870840.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/24570350622.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/27712896074.pdfIn PDF document text
    • http://katela.net/userData/board/file/topus.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbfe91dcfa---xoman.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/17235492380.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/jamoburisirume.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/gulodorululexotevusevi.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/67567393089.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/gezegejejepunomupufuniv.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/bakixitor.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/meronutejagi.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///jorosiravasisupeneku.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/dasuvedidejojevaf.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/wodukewoku.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/98974381505.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/fejopixane.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///32715582041.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/vodejumu.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_off0000e03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03A 10536 bytes
SHA-256: 4fcce4b66e6b25f4654236932f7d6c11e68fc1ac1953ed76bfc69084d04d81b7
font_01_sfnt_off0000f7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF9 17960 bytes
SHA-256: 62616167ebcf277f3b6b97a33e618290eb0cc17352984dace9bd4cd6f86559ce

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