Malicious PDF — malware analysis report

Static analysis result for SHA-256 813a3ae0c3bbb7b1…

MALICIOUS

PDF

88.2 KB Created: 2021-09-18 18:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffb19888d7504608784ef143374109c9 SHA-1: d32adcaa603c68cd9883ee3f22467033dfa4b19c SHA-256: 813a3ae0c3bbb7b1f269b680d30950e122273d4c2dd557e070b7c7663e6e45ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to unknown or potentially malicious domains, suggesting a link farm or phishing lure. The presence of external URI links and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://ngoinvest.com/uploads/ckfinder/files/zatilo.pdf
    • https://pakianco.ir/data/image/uploads/news/files/wukubemonewufukom.pdf
    • http://www.examnotice.in/uploads/files/42158484625.pdf
    • https://ikorti-iao.com/userfiles/files/95657146695.pdf
    • http://mikol-styl.cz/userfiles/file/1470832071.pdf
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/70384638094.pdf
    • https://tlkingatlan.hu/kepek/other/file/57632042596.pdf
    • http://stadion-zarya.ru/ckfinder/userfiles/files/ninuladizul.pdf
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/vimifagonaga.pdf
    • http://ptsound.com/plugins/ckfinder/userfiles/files/90016733562.pdf
    • https://teater77.nl/userfiles/file/54009357892.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e9241de6c---tafata.pdf
    • http://tofuyatogo.com/uploads/files/29339033740.pdf
    • http://gadkowski.pl/repository/filemanager/file/dafadovitamer.pdf
    • http://niszczeniewaw.pl/userfiles/file/40019867669.pdf
    • https://lmcmanager.com/ckfinder/userfiles/files/29581296340.pdf
    • http://yushendesign.com/images_fck/file/1631759074.pdf
    • http://master-sign.ru/ckfinder/userfiles/files/51707088207.pdf
    • https://supermagnum-bg.com/ckfinder/userfiles/files/52731652283.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/f92340961f2caa9428f72b5e35f7c340/47966558621.pdf
    • http://ks-klinika.ru/ckfinder/userfiles/files/nilabonafetewuri.pdf
    • https://www.willmarshelter.com/ckfinder/userfiles/files/voleve.pdf
    • http://verkaufs-akademie.com/userfiles/file/27412521719.pdf
    • http://101eyewear.com/luutru/files/dirofexegubawerofe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=my+hero+academia+season+2+ep+1+eng+sub
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd03.bin
3e67ae32526112deaea239ee252f4337bc0ccd48da82a0098f89f66cc9fbe3a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD03 16480 bytes
font_01_sfnt_off0000e408.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE408 16792 bytes
font_02_sfnt_off0000fc1f.bin
07b580c36ebd21536263a5811c4f4da2b3eae43118cf9f01ca68a10a26324b37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1F 11336 bytes
font_03_sfnt_off00011644.bin
6c6495ad94f8e118c2f32bdad7e1d56cfbb2d193c4bf6b58b2b8e43e8a939089		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11644 23592 bytes

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