Malicious PDF — malware analysis report

Static analysis result for SHA-256 8897e43c4130e993…

MALICIOUS

PDF

79.2 KB Created: 2021-09-15 17:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8f7eedf6670faf061dc1caa7ee340aed SHA-1: 6a684ef87a4d4c86d18eba8f149dbcac6ce8bde2 SHA-256: 8897e43c4130e993ed5cda3fd90c531b837bedd0a3dd87bdb1deedf7248a7cc8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution scheme. The ML classifier also flagged this PDF with a high probability of being malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=network+security+essentials+6th+edition+pdf PDF link annotation
    • http://swaptoys.org/ckeditor/uploads/files/32458471185.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/jigamavuderat.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/68956798012.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210911143350.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/40847219249.pdfIn PDF document text
    • https://majubesar.info/contents/files/57864740535.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/robipuwotozudosege.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/tufaxej.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/6147841359.pdfIn PDF document text
    • http://honda-vo.com/upload/file/65523825558.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/momojuvuvakam.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/53116484909.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/detujolusimekesuserisut.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/nukitivilanubuzunidus.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/33940323564.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/gozagepejezipowed.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/63262874470.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/nisawivupezoxedopo.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/tosopogunobalezok.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/37507041446.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210914080916.pdfIn PDF document text
    • http://headrepublic.pl/images/files/25648489632.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/xawejujatatoxe.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_off0000cd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE584 11256 bytes
SHA-256: 2aadd5ad784a06fd6ad13900c1e0c7ca600d9e843f3fbcc363eaedfdbf555ce2
font_02_sfnt_off0000fff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF7 18232 bytes
SHA-256: 946c8067845ea0cc0ce531f61eecaa062277c567bf3e1dfb6cda50b760856f0c

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