Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e37c739dfcad80…

MALICIOUS

PDF

79.2 KB Created: 2021-07-21 16:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5d84eebdbb6b976e16678004a5743de SHA-1: a76ab6bef2e22bcbaca129099ae38ab815081b3c SHA-256: 27e37c739dfcad80c8a8856d404ab46d88fd79bfe171ec67edc61b345d21abd8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains an embedded URL. Static analysis heuristics and a machine learning classifier flagged this PDF as malicious, with ClamAV also detecting it as a phishing trojan. The embedded URL, although labeled as confirmed benign, is suspicious in the context of a malicious PDF. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://feedproxy.google.com/~r/sq/ugae/~3/S-4CHg4Qmwo/square?utm_term=physical+education+project+for+class+12+cbse+on+yoga+pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f055c90d9e4679a059e882/1626363337238/17846603724.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f51020731d8c7c6f1232b1/1626673185169/american_flyers_firc_answers.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f1bea8edc7cb521d90a28b/1626455720261/stock_market_this_morning.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ecabfe80388a1034dafb0a/1626123262846/places_near_coorg.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60efd4800d8d0805bdb38bea/1626330240593/gofalonowitekot.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f646d73ca5073dfd62a361/1626752727164/pifezizufodelizujuzuwaz.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60efd175b3de5a36b124de69/1626329461612/fit_wh_tax.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60efe64798ba4d746116867a/1626334791694/12799312342.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f51306db752c5e49c07abd/1626673927115/about_cotton_in_english.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed91683b21860fe6732b17/1626181993011/how_to_unblock_friend_on_messenger.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8ae770d7388251f4f2fd8/1625861751205/nursery_rhymes_the_ants_go_marching.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f1364ed1fa142bceb096a5/1626420814424/estimated_blood_loss_during_delivery.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e91fdc6e267257943acc31/1625890780642/indian_rupees_rate.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f03a2ce00eb31d7cf082b1/1626356269036/vowigomepofokem.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec8aae668ba31612b6c3f0/1626114734639/levokabavilu.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f6250e2919ae181dc60203/1626744078471/bunugef.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_off0000d0fd.bin
f70342b5541ecd36f611b3670f0d45653529a005148bf484bdad6bfda8e4c56b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FD 16608 bytes
font_01_sfnt_off0000fc6a.bin
536931bfbcdd0419cba35e08eff5a55c8a7165ee7427ecca9c8f8e355886c7f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6A 11556 bytes
font_02_sfnt_off00011773.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11773 16792 bytes

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