Malicious PDF — malware analysis report

Static analysis result for SHA-256 7077c76d78c34e9c…

MALICIOUS

PDF

77.9 KB Created: 2021-09-16 09:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f6704810dfca24ed138f8274624bb93c SHA-1: 990063408c34c2a8e4f4c148c2f6516508592fd2 SHA-256: 7077c76d78c34e9ccd7c6197cd510594ed493242c2f9b1c7070052851b775830
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 pointing to disposable hosting domains, forming a link farm designed to redirect users. The primary URL suggests a lure for downloading an 'apk free download', indicating a potential attempt to distribute malware or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crewmak.ru/uplcv?utm_term=reality+apk+free+download PDF link annotation
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8db1afe42---41491794844.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/96756006083.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/jibatuzupobujabavadezize.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/58945512875.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/wugasevom.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/88204998088.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/94626067288.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/luzalileboj.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/zoxazasimigufimoreva.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/moribuvo.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/817991920.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/wixan.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/luzemax.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/vedavuxo.pdfIn PDF document text
    • http://polletnv.be/uploads/files/79350913382.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/masatoferotifapafix.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/4620394922.pdfIn PDF document text
    • http://wwstationery.com/files/file/fosoxebewabapekox.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_off0000cb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6C 18024 bytes
SHA-256: 42ba7558932983c57113a66fbdfb04abee9d116aa76933de957a6f9681d3839f
font_01_sfnt_off0000fa06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001121d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121D 10660 bytes
SHA-256: 26c77e5b8adcf13dd24279027ea5c2f588e0c926cdb6400a33b4dfac2704eb1c

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