Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f6d7f9c8013b98…

MALICIOUS

PDF

87.7 KB Created: 2021-09-20 23:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8fd0867e1eb61fee4f24c4d6e347827b SHA-1: fbbec4eaaadec6a8ea33dc9209e60124ed36d91b SHA-256: 16f6d7f9c8013b98db69bea7c06b9a866bd15300d87b9df4caf903a890776570
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pixomot.ru/uplcv?utm_term=how+to+share+files+android+to+pc PDF link annotation
    • http://www.sas.edu.mn/ckfinder/userfiles/files/genasuwupebamujafikad.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210910_151715.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/60056803667.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210918181231.pdfIn PDF document text
    • http://bndweb.nl/upload/files/20624509505.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/21133247072.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/jiniwakelup.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/75298762610.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/medanukidin.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/luwosokewaleg.pdfIn PDF document text
    • http://asfalon.com/__files/file/58719427227.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/37844973435.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/17216381848.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/17045786647.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/semugesitomalozewijapu.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/zifitazulufoduwifod.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/2579070514.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/29570756291.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/78806536268.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134b0d10924f---didebowe.pdfIn PDF document text
    • https://nhomphuongnam.com/upload/files/41315807557.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/68008623102.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_off0000f1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A02 10796 bytes
SHA-256: c7993a493aa1d1da7879f63df9171afd3dd3df5af0ec005bb953e0d5aee3b6b1
font_02_sfnt_off000122d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D1 18248 bytes
SHA-256: 6094bac529d45c099382fcf774ad1e608028c8a9db8445c6dbefbcb91e5d3b0c

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