Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dccb0f94273ac30…

MALICIOUS

PDF

69.5 KB Created: 2021-01-28 01:57:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 252817bfabc2102de136297a2d64336d SHA-1: 4318ecf84cc15e633341a16381f59be99f4e6646 SHA-256: 7dccb0f94273ac309a3b6045df6dd9a1e39673831711df1ae33a9f1f0720457c
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains references to 'Uncharted fortune hunter apk', suggesting a lure to download a game. The presence of multiple disposable hosting links and link farms indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/wb?keyword=uncharted%20fortune%20hunter%20apk PDF link annotation
    • http://sunshop.pro/31381879133b1r44.pdfIn PDF document text
    • https://cdn.sqhk.co/biposuba/Iighcge/the_walking_dead_season_4.pdfIn PDF document text
    • https://cdn.sqhk.co/boxadiweteve/ejgPihP/texawuzovisif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408599/normal_6006c587ac34a.pdfIn PDF document text
    • https://zovakilezogavi.weebly.com/uploads/1/3/1/1/131163957/kikikov_mobadigu_pisilaziruvos_navajugo.pdfIn PDF document text
    • https://tebugusenaj.weebly.com/uploads/1/3/4/8/134870623/7ac460.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467273/normal_5fc93ab9a53bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480403/normal_6001372ca86fa.pdfIn PDF document text
    • http://gravkamen.ru/jadomomubutaxejukkbm4u.pdfIn PDF document text
    • http://itravelgr.com/83811872870w2y4q.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/ohbhdHT/high_heel_cupcake_ideas.pdfIn PDF document text
    • http://forexgeeks.net/1000_words_examplemq778.pdfIn PDF document text
    • https://wuwotozon.weebly.com/uploads/1/3/4/3/134315251/doxusasaxu-fetekugimepogoj-nuzetilado.pdfIn PDF document text
    • https://cdn.sqhk.co/kamozipu/Iwjcgc9/71673299306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384464/normal_5fdb8e8805acb.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/naxizugenabi/sefeberomadefir.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/capacity_planning_in_agile_template.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_off0000ce14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE14 5088 bytes
SHA-256: db99ce673736b75a619cd613f4604dc2212c4e447d92271c272c28719e5fed5b
font_01_sfnt_off0000df66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF66 12124 bytes
SHA-256: 8240be15c74b2c4934bbced2ad73d000dcfaa4d1ef6f49686b0c2deaae5568ed

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