Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe2162ce430f2be…

MALICIOUS

PDF

77.7 KB Created: 2021-09-23 18:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dac0fe8536392060bfe0b7d4a6e17575 SHA-1: e7fb9c62d8a3fbf56ff7f8fcf1c485d3a422df3e SHA-256: bfe2162ce430f2be91ff8a4bf6b0448d97e20c1a9c73c22f949b1921aaedee89
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, strongly suggests a phishing or scam lure. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and heuristic firings align with a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://automag.pl/userfiles/file/73154159420.pdf
    • http://hidropro.hu/upload/24613380613.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161336798ea7b0---fomezow.pdf
    • http://devison-matras.ru/upload/file/dejiwakeloxexak.pdf
    • http://sitoad.com/bbqjoekey/files/202109011621308918.pdf
    • http://duoctruongxuan.vn/userfiles/image/file/lupopuluse.pdf
    • https://gres-k.cat/userfiles/file/73065513674.pdf
    • https://ywint.com/ckfinder/userfiles/files/1632067008.pdf
    • http://nurugelexport.com/ckfinder/userfiles/files/ranekedelaxoz.pdf
    • http://ailizia.com/userfiles/89224996768.pdf
    • http://fanta-life.com/userfiles/file/dibedomirove.pdf
    • https://meesens.be/KrMee/Tekstverwerker/71091035244.pdf
    • http://bptramptour.pl/files/file/zefilozetubukifidevadifij.pdf
    • https://carlojans.com/cms/file/borirema.pdf
    • http://chenruichem.com/upload/files/zixesutatizabebulowaji.pdf
    • http://kk-gorenjska.si/uporabnik/file/mirebonewepufabab.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4f3e58ff2---tukezo.pdf
    • https://thingstodobahrain.net/ckfinder/userfiles/files/94834878846.pdf
    • https://thietkewebseo.com/webroot/img/files/domigafaf.pdf
    • http://vindindex.nl/images/uploads/tekuzimitapexibowaxavepez.pdf
    • http://tks-forever.com/upload/2021/09/15/file/34255511346.pdf
    • https://palet-school.com/files/files/74122533077.pdf
    • http://mywayrtk.org/userfiles/file/78845492833.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sao+s4+dub
    • 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_off0000c580.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC580 16792 bytes
font_01_sfnt_off0000dd92.bin
a7d557914da591f6630e5e0567e1c36c39ad70420366c9dc23846c89da1db155		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD92 20736 bytes
font_02_sfnt_off00011374.bin
02e3b5d5fb2a978fed4704b3a28ddeb1e951736d4a5022a01e94f8eb0de14086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11374 10064 bytes

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