Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c1dba8d3ac714a…

MALICIOUS

PDF

88.1 KB Created: 2021-09-21 00:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 757f911d820f7ac77808eda151d2c4ba SHA-1: 13dd74b07df1942136838cc27cb3842e14ad4570 SHA-256: 84c1dba8d3ac714a540a47c2e7b870f53301091db5e727064701b201197ce0df
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The primary attack vector appears to be directing users to external links, likely for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://cottoneauto.it/userfiles/files/30972924162.pdf In PDF document text
    • http://dekoblickfang.de/userfiles/file/bojatugowogixige.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/pevejogosigogofedi.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/2474969980.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/dajosajurawobejazubiner.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/9701156039.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109151954336422.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/7775383599.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210919112116.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/45348632264.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/lolimebewabimuju.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210917_021703.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/8638522918.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/10768872144.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/53349313418.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/semonubate.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/10562729427.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/18900948281.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/19013518464.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/35764947866.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e4h8lia4edqchaglfkfuaavh71/bowixebab.pdfIn PDF document text
    • http://parateam.cz/file/86609764853.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/tagufanidusigejoz.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/75728759300.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/nazugilujudosazobivamik.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/kumumedex.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/57810459860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=android+native+email+appPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF611 17308 bytes
SHA-256: f15685eb7d0d10ac1344cbc5b7c0196b67efd5a37118a43b4a56107c12e1c32b
font_01_sfnt_off000122c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C5 10432 bytes
SHA-256: a6eff71d345d83d89888c64a31f416fb6dbfdf017644189a7f9dfa7f270c41a6
font_02_sfnt_off00013a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1