Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42595548ee22a15…

MALICIOUS

PDF

77.1 KB Created: 2021-09-16 08:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6d1c572c1709aae3e4a3a2ae0f1b2bd SHA-1: 5e5f6ba9e412734831a17d522e7f5e1bb72de8bd SHA-256: d42595548ee22a1509bc704f47cc103e57076cab55431146b113ec8264306559
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://falconltd.pl/cache/file/89022956547.pdf
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/17578487493.pdf
    • http://bradzo-ep.com/uploads/files/57414640788.pdf
    • http://japanbizkorea.com/userData/ebizro_board/file/fimilujakimupebufuteteli.pdf
    • http://argyleliquidations.com/userfiles/files/78620227898.pdf
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/81437352191.pdf
    • http://chunmianxian.com/upfolder/e/files/20210908110159.pdf
    • http://tandprotheses.com/ckfinder/userfiles/files/tasijosabitofilofebaran.pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/vukufiwawugumixetoz.pdf
    • https://vnjhanoi.com/upload/files/61890160614.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/xaromazilixuretosusufodol.pdf
    • http://diegogenna.it/userfiles/files/9974138195.pdf
    • https://rajatotogroup2.com/contents/files/rinolotidujid.pdf
    • https://lotte-ppta.net/beta/assets/file/14815559634.pdf
    • https://gornjastubica.hr/files/tezepiroto.pdf
    • http://makrostal.pl/user_images/file/durefow.pdf
    • https://stealthwindow.tw/uploads/files/202109060819181103.pdf
    • http://abwingsde.com/uploads/files/89317909212.pdf
    • https://sonntag-immobilien.lu/userfiles/files/viribe.pdf
    • http://ruishikaishi.com/upload/content/files/2021/09/20210908054334.pdf
    • http://vaonhaphatphap.com/images/uploads/files/68065347204.pdf
    • http://hycxchina.com/filespath/files/20210910060555.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=fifa+19+mobile+verification
    • http://perfecturology.cafe24.com/upload/editor/imagefile/77183414861.pdf
    • 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_off0000caa6.bin
ebce482b9fb4b795518d0f7adf051c28295eb5054eb77bacefda02f3e194b8a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA6 10732 bytes
font_01_sfnt_off0000e35a.bin
2d1ffa45dd2eb7a8d56c1c5feaed45f40e39a5ac45318481b35867d091929205		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE35A 17032 bytes
font_02_sfnt_off00010f1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1A 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.