Malicious PDF — malware analysis report

Static analysis result for SHA-256 1862d70686712845…

MALICIOUS

PDF

118.0 KB Created: 2021-09-16 14:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4efe4286476df0177c2d6136066690ee SHA-1: 61bbe3dc13846404522aee138274b4d6b6abf607 SHA-256: 1862d70686712845d4a2d2ce02f88f3a918a36da1dfd64b79784ff29000fd2c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains numerous embedded URLs, with one specifically identified as an external URI likely used for redirection. The PDF's structure and the presence of many links suggest it functions as a link farm, aiming to direct users to potentially malicious websites for phishing or further malware delivery. No scripts were extracted, but the overall pattern points to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=angry+bird+journey PDF link annotation
    • http://k3projekt.pl/uploads/userfiles/files/27125317801.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/23329975197.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/36421478103.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210909_822BC1D6A7F27835.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/38994342902.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/52082575934.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/55423047975.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/80124604563.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/xotarilasawi.pdfIn PDF document text
    • https://cape-electronics.com/media/file/xikurowosezovivezaki.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613e69ef5edec---gatopob.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/sofafimetolaturepowidujux.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/79297998473.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/rowugodoj.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/9080630866.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/givubozar.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/miforuralopemuw.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/91301922885.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/65967761216.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210914100416.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210915225605.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/tekisezogo.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_off00016927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16927 10416 bytes
SHA-256: 4e8495b41ca03190a79eef81837138c880f7db370fa980c88f57ff2a7aa64df8
font_01_sfnt_off00018090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18090 19028 bytes
SHA-256: e3eab20a68620b01ec47cd0ad87cb2b4f59603cdbb6e06e4aba23171e5463dcd
font_02_sfnt_off0001b280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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