Malicious PDF — malware analysis report

Static analysis result for SHA-256 895fbecb0d44b2cb…

MALICIOUS

PDF

88.2 KB Created: 2021-09-15 19:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 25adf60ad05eb2f86f75e9171b3eb553 SHA-1: a33581ae43ce2c5f0322fa3f7746efd74467fd19 SHA-256: 895fbecb0d44b2cbaf41efbcc36ba90c5e6d6832a208af86dc34f08f75b149fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are on disposable domains or used as redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://medvor.ru/uplcv?utm_term=roblox+loudest+audio+id PDF link annotation
    • http://www.herbertvanderbrugghen.nl/draft/kizijagex.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/tagav.pdfIn PDF document text
    • http://napiarsaigh.com/images/92211223224.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/xepozebonexamovox.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d05816915---kanepigusurugibuberuga.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/boledivusoreza.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/88764318460.pdfIn PDF document text
    • http://goref.ru/files/file/89077610306.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/81102407961.pdfIn PDF document text
    • https://comfort8889.com/upload/files/47056604807.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2cff14c71---zupalebimaxelemejos.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/53943818807.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/wipogafolidapisupok.pdfIn PDF document text
    • https://tdfstore.it/file/61816253455.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/rojorowunidexa.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/4649420240.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/4729497066.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/jevugilaf.pdfIn PDF document text
    • http://cosyromania.com/media/file/nadelojusimagit.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/lidudila.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/50878895363.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_off0000f137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF137 19076 bytes
SHA-256: 80ca950ef224628ea2cc27a2dff1def8851b56f7316631aeede32927dc347e4c
font_01_sfnt_off000123de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DE 10424 bytes
SHA-256: 6331c7588c105090571da430d64be1f49b46a5c5b5d5105851aad0da31db9c6b
font_02_sfnt_off00013bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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