Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab96d6ce35c07881…

MALICIOUS

PDF

81.5 KB Created: 2021-09-11 12:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4676bf9a72fe7eb4fd04824fd9e06d6f SHA-1: 164112644393f69ec1ba4ace7ac5779358879829 SHA-256: ab96d6ce35c078811427e137dc0c600b0bb895546c3e750ba91eacc84d498e2a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external links, including a link farm on disposable hosting, suggests a phishing or malware distribution campaign. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://studiotecnicobonoli.com/userfiles/files/debopepiduvej.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/munufomoke.pdf
    • http://geriatriccarenewjersey.com/userfiles/files/52209542066.pdf
    • http://armanetti.com/images/75826342416.pdf
    • https://dom4m.by/userfiles/files/mejokoxuv.pdf
    • http://fioredda.com/userfiles/files/27578302781.pdf
    • http://www.fuchingrading.com/upload/file/91765353278.pdf
    • https://igk-lilienthal.de/downloads/vekakamakotixe.pdf
    • https://ntpuvoice.com/ckfinder/userfiles/files/nidaxuzapobanu.pdf
    • http://rudolphalexander.com/uploads/files/kesajuvivudajugedamur.pdf
    • http://www.petersonassoc.com/emailimages/file/68315214862.pdf
    • https://mimpishio1.com/contents/files/64524158816.pdf
    • https://museuminiaturesbesalu.com/files/33061578831.pdf
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/favovojewuwo.pdf
    • https://greenfuturevietnam.com/Upload/files/94252252401.pdf
    • http://www.kickcommerce.com/userfiles/file/23068944456.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304cdded061---zofejevu.pdf
    • http://mmckno2010.zkosuchdol.info/files/netajili.pdf
    • https://steammining.com/userfiles/file/dukavuwogesupipi.pdf
    • https://zahrek.com/userfiles/file/31441465201.pdf
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/42618022884.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=play+store+app+download+windows
    • 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_off0000db96.bin
990f42d2a7f4310037160cbb66539ee3111cee262d97d0da4ebb016393f6309f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB96 17356 bytes
font_01_sfnt_off00010831.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10831 16792 bytes
font_02_sfnt_off00012048.bin
77d16a889089194e8242f829076b541b581e4ad1a600f1501b7dda67b65ee38b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12048 10588 bytes

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