Malicious PDF — malware analysis report

Static analysis result for SHA-256 14ddaec86d0a83a1…

MALICIOUS

PDF

74.0 KB Created: 2021-03-11 14:08:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98c71a2a5b8caa8b7f369e182439697d SHA-1: 1dddc9d834e6501bcc4a4dc7e55a1a52148c6b5e SHA-256: 14ddaec86d0a83a189c451425ade76753941719202e0c00c1ea885bdc10b7e83
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 potentially malicious domains, indicating a link farm or distribution point for further malware. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports a malicious verdict. The embedded content, though obfuscated, suggests an attempt to disguise the malicious nature by appearing as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/aws?utm_term=how+do+you+size+a+user+story+in+agile
    • http://blaugrana.ru/minecraft_earth_softonichwgcb.pdf
    • http://bufo.online/35519872215ieqmr.pdf
    • https://cdn.sqhk.co/sikudile/xhevgfn/zutovumewebajazasiwawi.pdf
    • https://cdn.sqhk.co/daborofus/jjQVraw/flute_ringtone_2020_download_mp3_pagalworld.pdf
    • https://cdn.sqhk.co/puzadowoke/gdiaYGp/larogowasuzoxididoxin.pdf
    • https://cdn.sqhk.co/lilavokolet/gfPYkyE/33466321418.pdf
    • http://leomannapov.com/42828603263bds7j.pdf
    • https://cdn.sqhk.co/lolajelor/1yJj839/pinball_machine_suppliers.pdf
    • http://newberginvestmentproperty.com/sapasulazarfd72c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_92ea4d493da24e629b461bc942703ff2.pdf?index=true
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_74680365283745e7a1c5e9835387e544.pdf?index=true
    • https://s3.amazonaws.com/magapeguwabe/25004300630.pdf
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_f0c1060f730742618d106eaf39d446a0.pdf?index=true
    • https://s3.amazonaws.com/robumuduluwise/votasewamefosexigow.pdf
    • https://s3.amazonaws.com/dagasopones/gegodibajunip.pdf
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_4b486a93e7b645a3adeef85458f9c442.pdf?index=true
    • https://s3.amazonaws.com/gonima/a_kannada_movie_hd_video_songs.pdf
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_d323ce099d894ca8a44e1c02ccc8143a.pdf?index=true
    • https://s3.amazonaws.com/jifedefujodu/bangla_typing_master_free.pdf
    • https://s3.amazonaws.com/fukezavazuj/75683130230.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_off0000e433.bin
6becb9b04a6dc20d560b7144c5524daa25831af30cbe06a07e11279d5fd9a074		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE433 5196 bytes
font_01_sfnt_off0000f609.bin
98c1d6fde97fdb60f19b585ec5601dfda2713302db651a5c5764d57cefed6639		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF609 10856 bytes

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