Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1a6ae2703d979c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-10 22:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0306f3cf1bbfa0f16c827926ef4473f7 SHA-1: b319fbd7916c4c55d0624a2c536b1f0a2f785525 SHA-256: dc1a6ae2703d979c7fd4d0ab9e8175235c449f55f9e87be39b3e3ae5d05f269e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or redirection scheme. The PDF structure and embedded content indicate it is likely intended to lure users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://c-amc.com/upload/files/45870248982.pdf In PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/xaluwixafazimi.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/naxiburujilir.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/rixik.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631137767.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/wefiwelero.pdfIn PDF document text
    • http://exim5.hu/_user/file/zolupe.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/roxujunabuwo.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/sotumuvaxef.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/vutovet.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3ddc0b88b---73853917645.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/46852924020.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/63705997698.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/4303578518.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/22994012887.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/sawat.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/25314754560.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/84272092936.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/vakodolevetijalazegade.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/43295213262.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/85879483373.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/90416356297.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/dibarezoborogujogixiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+recovery+tabletPDF link annotation
    • 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_off0000da17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF229 17652 bytes
SHA-256: 89460e1b84649d1b456bee3d56776c12646fcc776b10bca5dc70989c3d5fb13e
font_02_sfnt_off00011f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7A 10496 bytes
SHA-256: 18534f081c9ff292008f4f0fe98788fb40c160f97bbe152d52b0374b4865720d

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