Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c673d002e61eb9…

MALICIOUS

PDF

78.4 KB Created: 2021-09-13 01:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8e0f82b4899ba8799a966b3cb0c953aa SHA-1: 4f07cd6ad71938668427ae48d099ac2ececb9e48 SHA-256: 41c673d002e61eb9775d0d2f88bced54a2e39d5829d4781494b1babad3b60e2a
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 https://wastran.ru/uplcv?utm_term=custom+font+apk PDF link annotation
    • https://legyenegyjonapod.hu/userfiles/files/rakarira.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/xiwirifida.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22760100494.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/vemaxukunivirilosiw.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/jagivigisarevusukem.pdfIn PDF document text
    • http://capri.lt/userfiles/files/ponavexoruriwutafavugom.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/tekixo.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210909031102.pdfIn PDF document text
    • http://ipublicity.cz/data/file/52173290744.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-8/20210908125415517831.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109040503324039.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/dotupobunegipanisom.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/mowuvopuganufanivi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382c29e31d3---xufawifosefinobadojabata.pdfIn PDF document text
    • http://santabruna.cl/upload/file/mifurimokatadiripetuja.pdfIn PDF document text
    • http://sissonne.hu/editor_up/fanuvomezurebubuk.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/sozaxefuniwu.pdfIn PDF document text
    • http://wizclub.net/upload/userfiles/file/folozokesewepoxuka.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/regovowipudazogifezid.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/renimexox.pdfIn PDF document text
    • http://domplus.su/userfiles/files/53859165516.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/77347799139.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/dasezudofu.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/finuvadisu.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/98185558151.pdfIn PDF document text
    • 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_off0000c8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F6 19896 bytes
SHA-256: 307ed2bade17b22f82f07bac276c7b262f0904b1b7ebd648732e3b2210d3c8e6
font_01_sfnt_off0000fc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001147e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147E 10372 bytes
SHA-256: a67a9fd3e8ab438eb138c45363462fdba3aa1e590f363d0068a0c283810eafee

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