Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc3bced235bf3ca…

MALICIOUS

PDF

74.7 KB Created: 2021-09-17 04:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 691bd962418a21f6bb81e2c14d98e136 SHA-1: 97d08436be4ab90cf6eab01b5787870de62ea15b SHA-256: 5dc3bced235bf3ca7b54ce95fccf622824cc4ba5ee40b10a7d8e70de466d028d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external domains, many of which appear to be disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm, likely to distribute malicious content or conduct phishing attacks. No scripts were extracted, but the structure suggests a lure to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://smidgel.ru/uplcv?utm_term=read+text+messages+android+auto PDF link annotation
    • https://jordanadams.com/ckfinder/userfiles/files/27204524996.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/93476050374.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/67245668028.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///lobodulikesi.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/95781323723.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/golalivuvujapig.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/tezumunej.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/25348307348.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/57728501671.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16143a0345edec---ravugederiniparunif.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/koxifenitez.pdfIn PDF document text
    • http://calisnt.com/uploads/files/kelukoxokesenaguxus.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/97390852053.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/bakefowijigisinik.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/xefuvadivu.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/40297177841.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/9455032208.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/10263301053.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/52539717569.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/rolobewusedor.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/81025616148.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_off0000bffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFD 10792 bytes
SHA-256: 5fdf890f949d3e2464e5344258aea31aa0d8277617913398c4d4bd09309d343d
font_01_sfnt_off0000d89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89F 17616 bytes
SHA-256: e7e5e18612ed8fb120b3428f9753739e823cd41986123ee5226876e743e09ee1
font_02_sfnt_off00010589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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