Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3a0dc69d7dd4b3…

MALICIOUS

PDF

76.9 KB Created: 2021-10-06 18:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f58e0d51b9936413497e9d1dfc57a105 SHA-1: 16c8dd3c0dbe12765e71fa03afb7e02e1364e85d SHA-256: 3e3a0dc69d7dd4b3b0c066442705811aaf007e59d18ecc0e700015300ee09691
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as a malicious PDF, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous disposable domains, likely to host further malicious content or phishing pages. While no scripts were explicitly extracted, the PDF structure and link farm behavior strongly suggest an intent to lure users into downloading or interacting with malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://jngf.cn/files/file/74123462409.pdf In PDF document text
    • http://4darchitecture.org/img/all/73552703427.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/fetew.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/29805696090.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/wurojedexupalepitobu.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/mujuwavopusowizinoj.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/kagiperodu.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/dazamuzurewivizaworeri.pdfIn PDF document text
    • https://assofmt.org/ckfinder/userfiles/files/bemilefizaf.pdfIn PDF document text
    • https://bagstyle.uz/images/file/mogewonajulog.pdfIn PDF document text
    • https://ebmturonet.progess.com/userfiles/file/bopepewozezupolobegemik.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/19099939326.pdfIn PDF document text
    • http://alptw.com/images/files/gerut.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/83925036141.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a8ed38c50---88959128121.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/forez.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1630756676.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/varolofazuvilebenomirixo.pdfIn PDF document text
    • http://masonhn.com/d/files/zixaputabugumajoluduv.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/rosunosezotafesetudute.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/segujilozozaxemujepu.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/57049901237.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/fipikevexego.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/jejegenom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=horchata+water+recipePDF 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_off0000c781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC781 10228 bytes
SHA-256: 654ac3b647d3e35b90960f47f1bdccce36e0333c963aa4f1666e7d6d1f96e862
font_01_sfnt_off0000dea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 18340 bytes
SHA-256: 4ea6c1e32b39f42770dfe4f3439ab0989e57bd21077a53c2c5eff0cae5bc41a8