Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff2446fb9a7619b…

MALICIOUS

PDF

74.4 KB Created: 2021-09-25 04:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e597fdd1fa96d6734be07df47f154ed SHA-1: 60280e8657d48f600fbeb7583670c0136584b2b7 SHA-256: 1ff2446fb9a7619be92465bdd51d5cbbf045d00d489011e8af9bec64a2fe2ae3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content, though heavily obfuscated, are consistent with attempts to redirect users to malicious 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://oroblupiscine.it/userfiles/files/59188738451.pdf
    • http://ydchem.cn/filespath/files/20210914091518.pdf
    • http://budgettranslation.hu/sites/default/files/file/20190842488.pdf
    • https://contact-house.com/fckeditor/upload/file/30568743815.pdf
    • http://fsoa.cn/userfiles/file/55570866060.pdf
    • http://casier-a-bouteilles.fr/file/60176918309.pdf
    • http://www.autodesguacecoin.com/ckfinder/userfiles/files/naxizogesedulefar.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/7e411983d3532b7591360fecb7e65086/nalejiwavibafifuxa.pdf
    • http://eot.mn/uploads/userfiles/files/goxezirelitu.pdf
    • http://taociren.com/upload/file/210903120003650127j2g988o0i13v.pdf
    • https://rt-totaalafbouw.nl/userfiles/file/sofuguniwasupog.pdf
    • https://aquatrustfina.com/userfiles/file/93938355092.pdf
    • http://4998horo.gmmwireless.com/contents/files/7653378338.pdf
    • http://abwingscolley.com/uploads/files/25192091671.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/96066974711.pdf
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/zakenudodoj.pdf
    • http://sinhorelli.com/userfiles/file/xadajoxomoledutitujokaga.pdf
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/demodilenaladov.pdf
    • http://stellamaris.cz/userfiles/20981205235.pdf
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/14576852706.pdf
    • https://tsydesign.com/userfiles/jws/files/jenugekinijite.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/k6n0qofiituf916i667442b7le/rofikololoxe.pdf
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/19922892301.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+meaning+of+the+glorious+quran+marmaduke+pickthall+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_off0000b919.bin
69d65d81ae1fec579e5edb4aa1153f8aab1ee125b44dc8fc1e47b890fa3f4273		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB919 11368 bytes
font_01_sfnt_off0000d327.bin
ae685e701a5538ac81b1871e8726b385849112649bca5c172dfda2741ec27209		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD327 18972 bytes
font_02_sfnt_off000103e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 16792 bytes

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