Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce0a9443940945d9…

MALICIOUS

PDF

72.6 KB Created: 2021-09-24 03:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 669b97d275054a4fcdec5edf66cf051e SHA-1: 5f37225cba23e73ae01d3815f88b8034788d9339 SHA-256: ce0a9443940945d9c9a0097fc8a69d639c163c382e15086423e71918fc52fc75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with many pointing to unknown or potentially malicious domains, suggesting a link farm or phishing lure. The PDF structure and heuristic firings indicate it is designed to redirect users to external content, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://szalkasszorutacskok.hu/app/webroot/files/content/files/4016159942.pdf
    • https://e-fasteners.eu/media/file/xunokivugosowesodezube.pdf
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/vawuki.pdf
    • http://naturalfurnish.com/userfiles/file/jipuvatixoxuge.pdf
    • http://changwontour.kr/FileData/ckfinder/files/20210903_6849D552DB3EF493.pdf
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/28321034103.pdf
    • http://scsychem.com/upload/files/rodezasepapekizus.pdf
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/42623523183.pdf
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/71418644105.pdf
    • https://zahrek.com/userfiles/file/kodazutu.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161374cec2125b---kuwez.pdf
    • https://tidurmalam.com/contents/files/97062558720.pdf
    • http://dermatologomiguelgallego.com/miguel/fck/file/paparaxawidadunena.pdf
    • https://pasarangroup2.com/contents/files/96677635765.pdf
    • http://brenna-ski.pl/userfiles/file/xixugiv.pdf
    • http://abcbyspu.com/ckfinder/images_store/files/favolegorarewebozobimoxi.pdf
    • http://techbis.pl/files/file/24070814740.pdf
    • https://limsurempat.com/contents/files/94356263389.pdf
    • https://jordanadams.com/ckfinder/userfiles/files/dipoxeku.pdf
    • https://egyseg.eu/ckfinder/userfiles/files/xavad.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/ffe1af5a5556da4e65aa9becb0510f81/nimijavuzitadobuvaxe.pdf
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/32781349943.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=truck+sim+pro+europe+mod+apk
    • 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_off0000b9d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D5 16792 bytes
font_01_sfnt_off0000d1ec.bin
d092066feadf4bde9140697e52f9eca267bb8f8aadba3500b5d5cfa8c7a6131f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EC 10580 bytes
font_02_sfnt_off0000ea16.bin
c447f3baefcaa3b601bbd0544697940376eb18f7a0eb64f1ff1d157c3955583b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA16 16760 bytes

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