Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c95083f4b1c1503…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 04:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ca70c5b721704c8700f02297d47c1b46 SHA-1: ac2126969030867cb933091c5d89c6a945b617ec SHA-256: 8c95083f4b1c1503c6fd1d642dff47a75155440c1620d44af6da784133cbc180
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://queure.ru/uplcv?utm_term=all+of+me+by+john+legend+guitar+chords PDF link annotation
    • https://basalyemek.com/ckfinder/userfiles/files/8356534075.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/lajojalurutovamixe.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/25792491575.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/16557618978.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/guvevimetofajikagow.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/1182984002.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/42663490922.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/vapamasaxinubomitabujafu.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/3471e3a3db543ca1b2595e5091dc6c5a/46851805300.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161319f0a43adb---wububukas.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/sesemapuwuxenezagexux.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/gafefafupigeju.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1614383565f627---92062247809.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/lofenafuratokedet.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/53953443503.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/16838538676.pdfIn PDF document text
    • http://nineslash.com/user_file/file/tubovuf.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/gisizapuwipezux.pdfIn PDF document text
    • http://liyangah.com/Upload/file/fubupawipodulotonak.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/voxojawuxowalowafur.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/85978468808.pdfIn PDF document text
    • http://erimti.com/userfiles/file/96166746859.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/15566247881.pdfIn PDF document text
    • http://medrea.ru/upload/files/jolonefofepofokinoka.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/12487079980.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/nogimanasaf.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_off0000d8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B5 18180 bytes
SHA-256: 803cd2262d96f5374ea5788185f0cf1f5e743367f6f150a034d7cf868239f8ed
font_01_sfnt_off0001081f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12036 11388 bytes
SHA-256: 64f7215bc9bc5a862a787e2caeeedb2489f02478b76dc6302f1a72ae61b3f4a8