Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e20f7405c115d6b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 22:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9cd3a4bc25f46ae707e9da74e5265b49 SHA-1: a454c245ac1c8801f7f3df7318e673ac25324cd7 SHA-256: 7e20f7405c115d6b2d625738e3dcb706c94a428c467baacadd5227cf267a2940
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of an advance-fee scam, using lures related to lotteries or parcel deliveries to deceive the user. While no scripts were explicitly extracted, the presence of numerous external URIs and the ML classifier's high confidence score indicate malicious intent. The document's structure and heuristic firings strongly suggest it's designed to trick users into a fraudulent transaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://truongthanhco.vn/webroot/img/files/56090670924.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142559a04d6f---rarapuponuzeruja.pdf
    • http://evohome.pl/userfiles/file/rogujatanetore.pdf
    • http://getwealthythisyear.com/ckfinder/userfiles/files/zafibusepexadizuferi.pdf
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/kuvel.pdf
    • https://bimstudioinc.com/media/files/vudububetubololuwaroxoro.pdf
    • https://mclandpin.com/calisma2/files/uploads/daxeleragureve.pdf
    • http://www.amedna.com/userfiles/files/12381975892.pdf
    • http://ugyvednok.hu/userfiles/file/wopamujusalelovazegebasug.pdf
    • http://leguido.net/files/64866261049.pdf
    • http://quimicahj.com/admin/userfiles/userfiles/file/zivedasoragud.pdf
    • http://sgo-bage.com/public/files/files/zotupetusajusutis.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/3640946497.pdf
    • http://telekommarketing.com/firme_data/files/lulasuwerufimisurepol.pdf
    • http://snap-drone.com/userfiles/file/pomamagi.pdf
    • http://ahlhy.com/uploads/file/09165129617.pdf
    • https://casabresciani.it/uploads/file/71569313914.pdf
    • http://sangtaoad.com/uploads/userfiles/file/77009439769.pdf
    • http://waxiangyuan.com/upload_fck/file/2021-9-16/20210916095627432820.pdf
    • http://pickup-ws.com/userfiles/files/puzor.pdf
    • https://unosms.us/userfiles/file/81804388701.pdf
    • https://sanipacific.com/attachment/file/zakoluwevafogenumumexizof.pdf
    • https://kitapkapla.com/upload/ckfinder/files/47612172022.pdf
    • https://parlagame.com/calisma2/files/uploads/guwinowoju.pdf
    • https://lodoshosting.com/calisma2/files/uploads/14283811890.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+cast+to+mi+stick
    • 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_off0000de1b.bin
38d4c5b4579d4d561f455e28657170f8cdf0c262877820fab739d2b6eb3850ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1B 18008 bytes
font_01_sfnt_off00010d18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D18 16792 bytes
font_02_sfnt_off0001252f.bin
63c048a9e00c03e6b510cc32ac6e4ff9f08fe18fc8429ef558276318811c1acf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1252F 10180 bytes

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