Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7556662ac1085f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-08 16:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f24513d2a1836ad5557fffe65629c107 SHA-1: 0b121bab2f52b82f990c96f3363a2802fb33ddfd SHA-256: 3b7556662ac1085f72cd604b1f5ad745a6057bd83dbf607aa9c35bd813c7e465
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. No scripts were extracted, but the presence of external links points towards an initial access vector via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://smidgel.ru/uplcv?utm_term=big+data+analytics+pdf+wiley
    • http://benevolo.it/userfiles/files/tarawufozitixofami.pdf
    • http://intertravel.hu/_user/file/97052108133.pdf
    • http://tfh-filter.hu/_user/file/rarerudexoroke.pdf
    • http://www.civilhospitalpalampur.in/img/uploads/files/89634189878.pdf
    • https://gastriklandsbf.se/UserFiles/files/61547853526.pdf
    • https://meesens.be/KrMee/Tekstverwerker/83066854064.pdf
    • http://togclick.com/media/userFckfiles/file/27488433961.pdf
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/72263460683.pdf
    • http://drukarnia-warszawa.pl/pliki/file/netamewe.pdf
    • https://feldmann-spedition.de/pics/userfiles/file/34330062612.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135d0a91e2c3---vuvasokewinogogizoje.pdf
    • https://worldtradezone.com/userfiles/file/13741897736.pdf
    • http://zhuxintrading.com/uploads/ckfinder/files/20210905/16308181176763.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/obnvr82m9eqvhkfl4eauhntid4/bisajafononubevapugiwe.pdf
    • https://maryamghiasi.com/images/upload/files/gupumarepavedadotonarejev.pdf
    • https://guapa2.com/admin/fck/file/3350848328.pdf
    • http://el-system.jp/uploads/2012/files/96488195952.pdf
    • http://pizzeriadevita.it/userfiles/files/38145092654.pdf
    • http://clinivetmadonnadirosa.eu/userfiles/files/zukegabugelib.pdf
    • http://uralteplostroy.ru/content/file/69639713120.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd02.bin
75f183e81b5aa8cd5a26e00a6d132917e063f036580e8618eccb6ffcaeecce7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD02 18952 bytes
font_01_sfnt_off00010e1c.bin
68dd046175c44a0c49ccf868f5f63b7cd13f260da93efe7572d016bd802ef946		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1C 10828 bytes
font_02_sfnt_off00012725.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12725 16792 bytes

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