Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e0bdf441558ba6…

MALICIOUS

PDF

69.8 KB Created: 2021-10-01 00:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 254e9dfc934a3adf58526e3c8095d8c4 SHA-1: 057d0b7dbb6204bcd42bcdc0b56483753a85547b SHA-256: 18e0bdf441558ba668d148ec221c0ea7ee300b7216d27fe398c016ae09578e0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by indicating a link farm on disposable hosting, a common tactic for such attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://quaretti.it/userfiles/files/57926601422.pdf
    • http://jncs.kr/page_data/file/20210917165425.pdf
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/wujuruxizonusum.pdf
    • http://royalgroup.at/tmp/mipikamuzodolifojag.pdf
    • https://klcmekatronik.com/ckfinder/userfiles/files/53956208424.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/fk2npbok4397a8nik7chjnj5e7/74565443761.pdf
    • http://belly.bpv.su/content/files/files/67513021936.pdf
    • http://viorina-deko.com/images/file/70438801770.pdf
    • http://giteduguedesboires.com/userfiles/file/42490002386.pdf
    • https://www.oalysa.cz/ckfinder/userfiles/files/fifex.pdf
    • http://9262895.ru/ckfinder/userfiles/files/nowurovebagozoni.pdf
    • http://abwcoliseum.com/uploads/files/vurokep.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/mbfe7hhaf775f7obg1ebcjgjgr/87398751752.pdf
    • https://jhservice.net/imagenes/galeria/files/77680644903.pdf
    • http://hzxf.com/images/upload/File/jedakoxeboba.pdf
    • http://schule.havonix.com/ckfinder/userfiles/files/88131682585.pdf
    • http://aostavet.it/userfiles/files/remam.pdf
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66828697952.pdf
    • https://sieuthimaytinhcu.vn/upload/files/rogetanafezefubiwo.pdf
    • http://uitvaartverzorgingsindex.nl/images/uploads/makotigopadepevixo.pdf
    • https://office-agglo-larochelle.fr/userfiles/file/dezipine.pdf
    • http://ylgems.com/file_media/file_image/file/5068751553.pdf
    • http://jiehuist.com/userfiles/files/dunegimokusaro.pdf
    • http://shopcode.ru/uploads/file/3651143494.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=midnight+wanderers+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_off0000b25d.bin
0bf2d6197a2e7d7748e82b0f749f23f9341cc30433689fb87edc3f1ed48c31d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xB25D 15300 bytes
font_01_sfnt_off0000d950.bin
84e98da43c0c6e391dcb1c0054817e4d20309d057029c6fec2426add3452fcc1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD950 10676 bytes
font_02_sfnt_off0000f196.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 16792 bytes