Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec436fc060035c50…

MALICIOUS

PDF

67.2 KB Created: 2021-03-24 10:58:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05d5f9bd5ccba4f5294d22a0efa5a02b SHA-1: 268d5d5c9cd0cb06476ef21222e3833943ff65d9 SHA-256: ec436fc060035c50dacb7cc12effd5972b14c8cb8521873d463165f8349739dd
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded links pointing to disposable hosting domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains keywords related to manuals, reinforcing the lure.

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://mezovuduw.ru/wix?keyword=premier+oven+manual
    • http://pigigozoruda.mypressonline.com/84134176091.pdf
    • https://xipinirobidojuv.weebly.com/uploads/1/3/4/0/134017625/2641751.pdf
    • https://static.s123-cdn-static.com/uploads/4426953/normal_5ff9ceed7224b.pdf
    • https://dexajuvado.weebly.com/uploads/1/3/4/4/134470202/4325311.pdf
    • https://cdn-cms.f-static.net/uploads/4483070/normal_6042f460cf17b.pdf
    • https://ponawexem.weebly.com/uploads/1/3/2/7/132740185/486d9eb9.pdf
    • https://cdn-cms.f-static.net/uploads/4369932/normal_6054edd82d660.pdf
    • https://cdn-cms.f-static.net/uploads/4486034/normal_6051995a1735f.pdf
    • https://static.s123-cdn-static.com/uploads/4422150/normal_6004b06dd895f.pdf
    • https://nenafefetu.weebly.com/uploads/1/3/1/4/131406263/dokakalese.pdf
    • https://nizevamil.weebly.com/uploads/1/3/2/8/132814567/fozobudubej_gataparevuv.pdf
    • https://static.s123-cdn-static.com/uploads/4366324/normal_5fc5d3fd89399.pdf
    • https://xapeposatu.weebly.com/uploads/1/3/1/4/131437079/02327b68e677.pdf
    • https://kufoxigokutef.weebly.com/uploads/1/3/1/8/131856815/dorojo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gisujubolidine/kigivawife.pdf
    • https://s3.amazonaws.com/zolerazowubow/8493698839.pdf
    • http://tefetuzuzip.myartsonline.com/futexukagumune.pdf
    • http://bitines.myartsonline.com/how_do_i_connect_my_behringer_x32_mixer_to_my_computer.pdf
    • http://bexukavibume.myartsonline.com/16297549704.pdf
    • https://s3.amazonaws.com/bupijila/spotify_ios_8.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd0c.bin
6f11cc68b22ded0305369156af446f8c3e93af23c0bab21b922303b79ec1a9d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0C 4712 bytes
font_01_sfnt_off0000dcfd.bin
968403d19a83dc434dd5fc0bab16440475c60af2d643154e9f4b9f050a5e8d0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFD 9796 bytes

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