Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e85e8a8531de127…

MALICIOUS

PDF

86.6 KB Created: 2021-10-06 13:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 99f2a2f2febecf36f188fe4cca40f9c9 SHA-1: 98195b077087aa06a955cd9c87a4faa14e2a079f SHA-256: 7e85e8a8531de127d5d85a19a0079f75b170e53b0db8caad5da1101c4470b7c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for distributing malicious content or conducting phishing campaigns. The presence of these links suggests the document's primary purpose is to redirect users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://dienlanhtruongson.com/upload/files/ditepepudef.pdf In PDF document text
    • https://dampinggame.com/calisma2/files/uploads/9296846251.pdfIn PDF document text
    • https://kapefashion.com/files/files/xoboxuditagarusovijawepa.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/rituwaxuwapi.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/kuvunolanajemin.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/vigogevekojagugi.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/sujefokig.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/kudipovitoniwewo.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/lezonixikaxawozogofazofan.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/62630578625.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/11888086567.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/ligogile.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/19913355693.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/17733827228.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/25603279988.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161419d9f80f12---86624859941.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/gusiwakaz.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615657898139e---70620179678.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/zarazemogumodokikiki.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/xeporuba.pdfIn PDF document text
    • https://sentralperdana.com/file/43435535840.pdfIn PDF document text
    • http://myesen.life/userfiles/file/14380090969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=nursing+care+plan+for+swellingPDF link annotation
    • 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_off0000e6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC0 20664 bytes
SHA-256: 732adaebce872475c78608404ee055ac45c37e34f7fef5ae97eec08ad84c1695
font_02_sfnt_off00013422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13422 10720 bytes
SHA-256: 34a845651421816e051bf72323adcd74f579ba68eb575657f6bac4961f3cc929

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