Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7cc34e90657bf6…

MALICIOUS

PDF

79.2 KB Created: 2021-09-13 13:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c84d54bde4afddc0b00b92ea1e8d8570 SHA-1: 4459918a6a39d9472e7e14e438916df19fcf4fcd SHA-256: dd7cc34e90657bf64c8270241ac16bafb5c79d40b341413ecaccc62a7e0e93a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to potentially malicious or phishing sites, indicating an attempt to redirect users. The PDF structure and the presence of external URIs suggest it's part of a phishing campaign, likely using social engineering to trick users into visiting these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=the+courage+to+be+disliked+pdf+online PDF link annotation
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613beee3f3feb---dedurukinameb.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/87138255281.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/1811624232.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/65574492793.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/5349546079.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/14875559245.pdfIn PDF document text
    • http://enkepharma.com/upload/files/sisuzew.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/13634286807.pdfIn PDF document text
    • https://pepsima.biz/files/file/walipugawagil.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/kosarozebimuniremi.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/33523645711.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/tarujuxudukudelimob.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136fd1cb9e34---gagiruje.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210901_092787A51B494C99.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/gomatugejozi.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/78567888087.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/31612314792.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/mujisamadote.pdfIn PDF document text
    • http://195exim.com/datas/files/39500246004.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/loduregab.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/68406370025.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuruwus.pdfIn PDF document text
    • https://bursac.net/userfiles/file/sijalozebemiku.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_off0000ced4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 11192 bytes
SHA-256: 4c59ed29ffcbd747732fbd9db7019cd41ef1459a3f04cbf82ecd38b4e150d1b0
font_02_sfnt_off000100a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A5 18056 bytes
SHA-256: 9183959717c3ba4a6612fcf5aa003e7594af5e3789adc3d5cc4197f744689d78