Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b141358c4a8f3d1…

MALICIOUS

PDF

79.3 KB Created: 2021-09-24 10:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1c63a410eb0993b732ef45b73064c71 SHA-1: 8713a6d942d5f9946d9048258d09b221673b3d05 SHA-256: 1b141358c4a8f3d1a0e41464227265101978edbfee260c3c3cb813915b30ad13
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document is designed to trick users into providing a password for an archive, a common tactic for evading security scans. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://hojoairport.com/images/file/zagilelimiji.pdf
    • http://tl-maskinfabrik.dk/userfiles/file/jigusetoputitaliraduzama.pdf
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/38906641127.pdf
    • https://psfund.org/public/uploads/files/cms_files/90071769929.pdf
    • https://santechnikosdarbai.lt/images/files/94824800983.pdf
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/vevilujuxami.pdf
    • https://observatoire-omic.org/documents/file/tiseradanedevojezurosudem.pdf
    • https://harteron.ee/userfiles/file/jaxarepigozaj.pdf
    • https://dpengineers.info/admin/userfiles/file/fevadetiwosewuj.pdf
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/mowobudotukidenibugeni.pdf
    • http://palletgoanloi.com/img-dn/files/95209398632.pdf
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/23518757585.pdf
    • https://trinityautorepairs.com/uploads/files/wizipijarupil.pdf
    • https://war-old.its.vn/new/userfiles/file/33161185434.pdf
    • https://pianotuningdarwin.com/userfiles/files/tularapet.pdf
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/79270991091.pdf
    • http://simsvizag.com/contentimages/file/71884439109.pdf
    • http://npas.ru/pic/file/84433849731.pdf
    • http://okeefesreef.com/ckfinder/userfiles/files/balikujivimoxafubijekoj.pdf
    • https://pui-vital.ro/msg_media/file/bitividut.pdf
    • https://alrukn.co/userfiles/files/11566414641.pdf
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210915161235.pdf
    • https://livermore.com/wysiwygfiles/file/dixiparedakibulavawupivi.pdf
    • https://helicopterleasingservices.com/userfiles/files/65307597916.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=fyuse+3d+photos+app
    • 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_off0000d144.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD144 16792 bytes
font_01_sfnt_off0000e956.bin
ded6c70884f95c08ab80ff5844642973aa8951c004618bc3a32204b9374a391f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE956 18036 bytes
font_02_sfnt_off00011803.bin
1ab3a5de71444fca00a90fd17daa3f5f23ac0e41faea1cfc17474b157eeca37f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11803 10512 bytes

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