Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb908080347aeb50…

MALICIOUS

PDF

92.2 KB Created: 2021-09-19 09:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9724189c637aa3ced4a029e7a2c0dca SHA-1: c3c38ace4cdcbcace50ca556b9022a711b2a1237 SHA-256: cb908080347aeb502a0c462aff9f5d54b2227d3241d98766a41b4c47b1120f51
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=gcam+apk+samsung+m31
    • http://www.keizerco.nl/userFiles/file/20848995408.pdf
    • http://sakaryakasaplarodasi.org/userfiles/file/pojutanob.pdf
    • https://shian-jin.com/UserFiles/files/29314851654.pdf
    • http://lexus-custom.com/js/upload/files/43905177974.pdf
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/varewesizu.pdf
    • http://websteravelandscaping.com/editorData/file/55458123902.pdf
    • https://fishuntpesca.it/file/19540076683.pdf
    • https://lyonsinn.com/nbloom/fckuploads/file/8475959777.pdf
    • https://cqhuaan.myhost360.cn/upload/files/09-18-13-47-59-19.pdf
    • http://uptownfallschurch.com/uploads/files/40294227622.pdf
    • https://pima-alarms.net/slicice/file/19644301323.pdf
    • http://agriturismolionsfarm.it/userfiles/files/lonulisomosizovobenub.pdf
    • http://ikra-ekb.ru/files/fckeditor/file/46316519967.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613332e058c99---vixojaru.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161443289c7816---xofubaniwegifasibumu.pdf
    • http://automozg.by/upload/editor/files/gevejasizo.pdf
    • http://naturalmis.com/userfiles/file/40819897454.pdf
    • http://makinsushi.com/uploads/files/tezofolitatukupi.pdf
    • http://kustari.net/userfiles/file/piwarawulin.pdf
    • http://nowyhotelik.pl/userfiles/file/ropopove.pdf
    • https://keiba-like.biz/js/ckfinder/userfiles/files/vesovoxikovebiduro.pdf
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/kepijudiwexesuxef.pdf
    • http://elhammagazine.com/ckfinder/userfiles/files/77849804166.pdf
    • http://picassogift.com/Uploadfiles/files/11676416709.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_off00010307.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 16792 bytes
font_01_sfnt_off00011b19.bin
e5ba17edc8b23e84e454cc90c59d8202b6cad59860bc1dbfe7ad5178a2b89206		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B19 18572 bytes
font_02_sfnt_off00014b05.bin
e4fa363f2f6782a442ec9931bdbc87ba01956bfa4d7788887dfbbf6629640e2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B05 10584 bytes

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