Malicious PDF — malware analysis report

Static analysis result for SHA-256 106836cce571f7eb…

MALICIOUS

PDF

84.3 KB Created: 2021-09-11 18:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7a58aa3df4f0db1bf51f56c87b099e2 SHA-1: 78469e8e4977cd805bcfa09f7c42b16d9aecfa52 SHA-256: 106836cce571f7eb8f2ce858012d716cfaca2b10242799f857d794de49646646
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many of which point to disposable domains or are used in link farms, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=tuning+out+television+reading+comprehension+answers+pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/2qf4f9eocc7tto26c1ltm74gtb/32017714209.pdf
    • https://elitstroycraft.ru/source/file/redirelufu.pdf
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/nixojozin.pdf
    • https://visualarchive.bg/files/22433195013.pdf
    • http://apsencollege.org/test/fckeditor/file/17805377969.pdf
    • http://jfac.kr/ckfinder/userfiles/files/xoxigarizozofizotizarur.pdf
    • https://novitas.ro/files/86369087616.pdf
    • http://a1-automotivegroup.com/upload/files/45752286201.pdf
    • https://firesystem.ro/imagini_ws/kaxarigofidirejufa.pdf
    • http://agataklimowska.pl/userfiles/file/77559213487.pdf
    • http://cartopack.com/Images/file/xakokolabavetewododezopo.pdf
    • https://babetravelling.com/ckfinder/userfiles2/files/liwivakozenaguzelavar.pdf
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/42238126745.pdf
    • https://pasarangroup1.com/contents/files/joduvalaxatu.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/87526005243.pdf
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/52151540433.pdf
    • https://stotex.rs/files/jopobuzisikutufij.pdf
    • http://grubstreet.ca/ckfinder/userfiles/files/vamelazenepilega.pdf
    • http://tomgiongvip.com/uploads/files/file/begusaj.pdf
    • https://davnosti.ru/upload/97469174198.pdf
    • http://land89.com/ckupload/files/laluworagatajivuwimikal.pdf
    • https://tarsiman.ee/files/file/bexabibitepe.pdf
    • http://gsmontaggi.it/userfiles/files/gimusugabexekudezasedulo.pdf
    • http://cantinachitarra.it/userfiles/file/46671097907.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_off0000e019.bin
5af06f3f626400b08a965eff2dfc77c5db81683388e38e2d574ad4f9865477aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE019 11284 bytes
font_01_sfnt_off0000fa45.bin
6b9dc043b4580562f85687af5ab876e33f49149aab2b1bb637e065ce67eede65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA45 18924 bytes
font_02_sfnt_off00012b2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2B 16792 bytes

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