Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbdddf0a7594db53…

MALICIOUS

PDF

79.4 KB Created: 2021-09-09 21:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a42c6551274dc3701ace4426180be68c SHA-1: de045a57b7afcf1c923c3d82df4cc13ecedae8d0 SHA-256: cbdddf0a7594db53f5e9c34464b4514ad306d678cd8ad0d4587d55ba1fd763ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm pointing to 30 distinct hosts, suggesting a phishing or malware distribution campaign. While no scripts were extracted, the presence of numerous external URIs and the link farm nature strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://khonggiansachhanoi.vn/uploads/files/pimuxufolusumemitizup.pdf
    • http://haiqi-machine.com/d/files/maxawuler.pdf
    • http://orvositudasbazis.eu/images/upload/file/sufimeze.pdf
    • http://avvocato-callegaro.it/public/file/9459833892.pdf
    • http://elitaliaweb.it/upload/file/remizobedidipe.pdf
    • https://factorysales.com/userfiles/files/53403870056.pdf
    • https://maychieuvinh.vn/upload/files/lokilosewapimifomodilino.pdf
    • https://dolupin.com/calisma2/files/uploads/nodotova.pdf
    • http://highlevel.pl/userfiles/file/53689482001.pdf
    • http://d-a-s.cn/userfiles/file/safexodijesovuvabubemunut.pdf
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45893611110.pdf
    • http://taixingchem.com/uploadfile/file/20210909200037893.pdf
    • http://asremajazi.com/uploads/files/67559119901.pdf
    • http://nowator-zpu.pl/userfiles/file/kilutodexezuzo.pdf
    • http://somsit.com/ckfinder/userfiles/files/pukil.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613426f0f3b24---9398118472.pdf
    • https://dalton-english.com/userfiles/file/mepavalilabesixubebozavu.pdf
    • http://clinton.abwingsmd.com/uploads/files/80421053798.pdf
    • http://artio.pl/files/files/78797177140.pdf
    • http://tongchangkj.com/uploadfile/file///2021090305555316.pdf
    • http://emanuelarombiarchitetto.eu/userfiles/files/64849089448.pdf
    • https://phukienbep.net/media/files/segemuxuvowomalakaridir.pdf
    • http://aroma-es.site/yamituki-n/uploads/files/javivebiguraruvilaputex.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=deezer+premium+apk+download+free
    • 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_off0000cd7c.bin
db6637221be03123ead83443758e27e5b99c1403f93897a12fceb0f26a0a776c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7C 10732 bytes
font_01_sfnt_off0000e625.bin
5fc54b80b43cb9df1745272e041ee3382381e8a9f53d0e7986a931dfca1cd4fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE625 19088 bytes
font_02_sfnt_off000117ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117AD 16792 bytes

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