Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fedb6032f462ca0…

MALICIOUS

PDF

77.7 KB Created: 2021-02-15 05:53:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f3e1086fefe99e578b71f8616588158 SHA-1: 740efd1670bd3bec396273971040af751b38993f SHA-256: 8fedb6032f462ca0e0cfd183644fa5f793bed75e152363b382cce1a3caddd63a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on various domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wix?keyword=carrera+de+velocidad
    • http://sozikibonoda.iblogger.org/canon_cannot_format_card_error.pdf
    • http://kozodomu.22web.org/18354887553.pdf
    • https://zomimodobi.weebly.com/uploads/1/3/0/7/130739583/187392.pdf
    • https://gokivasinu.weebly.com/uploads/1/3/4/3/134334496/4724649.pdf
    • https://mosuvixixe.weebly.com/uploads/1/3/0/9/130969854/9124005.pdf
    • https://kuburabet.weebly.com/uploads/1/3/4/3/134362545/tigusu.pdf
    • https://zadavutuni.weebly.com/uploads/1/3/4/3/134343582/boxejosixonov.pdf
    • https://dozunetad.weebly.com/uploads/1/3/4/4/134472758/zuvazedokifa_potorel_gaweweb_vagigikurujom.pdf
    • https://dudixugodibemuf.weebly.com/uploads/1/3/1/4/131406925/003d2c.pdf
    • https://pabidiwamudobav.weebly.com/uploads/1/3/5/2/135299897/a49984475.pdf
    • https://zufavaxevonek.weebly.com/uploads/1/3/0/9/130969036/nelirabuzamim.pdf
    • https://gigewobejej.weebly.com/uploads/1/3/4/6/134638222/9334836.pdf
    • http://xabidewukolesas.66ghz.com/lung_collapse_radiology_report.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bakoloj/firebase_authentication_android_app.pdf
    • http://sarovagovoz.rf.gd/tofikimonor.pdf
    • http://rolozaj.epizy.com/aha_asa_2018_stroke_guidelines.pdf
    • https://s3.amazonaws.com/dufekifaral/bengali_cartoon_film.pdf
    • http://tapanowi.epizy.com/mififewogawulawubuguwoxaz.pdf
    • https://s3.amazonaws.com/busutafitufe/periodicos_capes_plataforma_cafe.pdf
    • http://vovivufevalo.rf.gd/68218452053.pdf
    • https://s3.amazonaws.com/posufij/47116214939.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7c0.bin
1fa24bbaaa4df8b152a62cef673706002e840c6509af693867637dd0b4a88983		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 4440 bytes
font_01_sfnt_off0000f6e4.bin
481b1f4c796ec4d4d65b678fc7a01d3e175645d22ec0fecb8ff332e75f744613		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E4 11144 bytes
font_02_sfnt_off00011b1c.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1C 4324 bytes

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