Malicious PDF — malware analysis report

Static analysis result for SHA-256 b008dc43cda4e556…

MALICIOUS

PDF

64.5 KB Created: 2021-01-27 04:04:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1dc8d82c8339fd6be4a571115e5c1ffb SHA-1: 72820e0b872c5881ac515000dd7cafdd5966cfef SHA-256: b008dc43cda4e5564f90098ae775176aaf809ae60f929a9148260decd4f65876
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and a link farm heuristic further supports the conclusion that this file is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=bellagio+nail+salon+gainesville+fl PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4498366/normal_5fec4e1d81bd5.pdfIn PDF document text
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/9179553.pdfIn PDF document text
    • https://cdn.sqhk.co/mogidamiko/XiNHSiG/fisapapijelepedati.pdfIn PDF document text
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/1b0346c40cfab9.pdfIn PDF document text
    • https://zovakilezogavi.weebly.com/uploads/1/3/1/1/131163957/514ca8.pdfIn PDF document text
    • https://tafevivif.weebly.com/uploads/1/3/2/6/132682704/kapas_zaxuxo.pdfIn PDF document text
    • https://tikodukika.weebly.com/uploads/1/3/0/7/130776738/8933651.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/ijckjeD/37257568829.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482188/normal_60034ce5c7646.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/eheheQb/ledojuvogagaxup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/retisovojor/tizafodosim.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/muxogijinalisabaputugote.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/84201669323.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/24836832778.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/problem_statement_template_mckinsey.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC084 4948 bytes
SHA-256: 5f65aa332264517f65db3401b8d093deb0c011e78c55952011be78ce101bd7e9
font_01_sfnt_off0000d183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD183 10432 bytes
SHA-256: b64befa94f80d03d69d0a11442209edfcb6dfed45f1d28a0ee4f6f18fb1024f5

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