Malicious PDF — malware analysis report

Static analysis result for SHA-256 80ca42aa281d7dd7…

MALICIOUS

PDF

76.8 KB Created: 2021-09-23 02:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b18310a56b1b40041c76096f2e16745d SHA-1: 9d6fb9354d7fb6217bc12cf86025da98b252b46c SHA-256: 80ca42aa281d7dd7ba38b98a37ff7f460af72c35add544cc4cc7e2ad2f26658a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=android+cryptography+library PDF link annotation
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/4d49833f6cacac87592063c198eba975/83370542036.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/4023397352.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/laronepemowilunatami.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/18919992332.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/rerojoxumefajelesefatatuw.pdfIn PDF document text
    • http://herve-coiffure.ci/files/94492299960.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/22622650616.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/rikinubimedavonizoba.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/20177497714.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/lekume.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/jitiraxudakatu.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/54446167547.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/numanutes.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/30800440678.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45902685596.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/29277113767.pdfIn PDF document text
    • http://dongyuanxa.com/v15/Upload/file/20219236788272.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/467684409.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/57002692286.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/jidinuzufepezuguxazazemes.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/kujujotakaxam.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/26091482705.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/rojemobivujivowozavow.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-16/20210916065748381920.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_off0000c594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC594 10728 bytes
SHA-256: 1fc3ec4c09cc98876bc8b896a31fe7b69e49830048ebb6e4a852b9004ac8a82c
font_01_sfnt_off0000ddb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB3 17792 bytes
SHA-256: 699a6a0017322afe0d374c2daeec4e32ffedbdc780fc7fc1a89cdd83e1767a27
font_02_sfnt_off00010bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1