Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ecc018e03b07f38…

MALICIOUS

PDF

76.3 KB Created: 2021-09-19 01:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a9b756dd1a48397a2730bda77f4a525 SHA-1: 6f3e950a0ec4f4e9628df40138311a46b4b0675c SHA-256: 3ecc018e03b07f380a4b8af1a07f8cb319723bef61f75d500a6ae05e787a2cb8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://philabc.ru/uplcv?utm_term=roblox+original+apk PDF link annotation
    • http://rklatex.com/userfiles/file/zelowofepivizo.pdfIn PDF document text
    • http://esistore.be/userfiles/file/68586507895.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/fironisupupulilesivid.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/duludunitofebufelexu.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/kuzefadikeropijane.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/fulubuxe.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/34606483523.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/dajozakogikuxoxuratal.pdfIn PDF document text
    • http://ahknchem.com/upload/files/21975201261.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9deb40f9f---rurojubafowuri.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/20102795325.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/77486414050.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/25522768527.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/vokokelu.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/62447860418.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/20923507184.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/tuwokevilupinop.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/9657434190.pdfIn PDF document text
    • https://full-e.com/app/webroot/userfiles/files/20210915_205258.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/sabinizitozo.pdfIn PDF document text
    • https://dhesient.com/media/92641474370.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_off0000bd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7D 21312 bytes
SHA-256: b27c4559abc71f3882506fc21020a6f13022c68139ff5ac7cd89c292e2f74988
font_01_sfnt_off0000f48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA1 10408 bytes
SHA-256: 5d354551c1ecf3a171113adf991a580a911b3dd3904b35f3373d0d3c386d4bff

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