Malicious PDF — malware analysis report

Static analysis result for SHA-256 877a6535b1edfe4e…

MALICIOUS

PDF

86.6 KB Created: 2021-02-18 08:03:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 359fe10e74ba88df78b8d6b7c8e5470b SHA-1: 4aff8bce207b0e98a477bd6d1db7008eaad0dc0e SHA-256: 877a6535b1edfe4ed6080d23cc9a5e2a97a2bb5c7909a5465e5dae2a67c102fc
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure, likely intended to direct users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=multiline+comment+in+matlab In PDF document text
    • https://cdn.sqhk.co/razonavari/shKhgck/802156770.pdfIn PDF document text
    • http://jiwitoletazadag.iblogger.org/magazine_size_photoshop_template.pdfIn PDF document text
    • http://legendnat.space/5474502175keod4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_602c7d8a99b19.pdfIn PDF document text
    • http://kind-insta.site/barreras_para_la_comunicacion_eficazoyzxe.pdfIn PDF document text
    • https://cdn.sqhk.co/xedogigiloli/jj2jbji/nobiwokodexajameri.pdfIn PDF document text
    • http://gejepixaso.iblogger.org/sabmiller_plc_annual_report_2017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495244/normal_5fda4720822c6.pdfIn PDF document text
    • http://sosed.market/600202331379abjw.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/hhLdidP/nfl_games_today_on_tv_in_los_angeles.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/b6ifWjR/kingdom_new_lands_wiki_farm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479917/normal_601dc0507afb2.pdfIn PDF document text
    • http://milansit.space/jilunareridofipijk8vd.pdfIn PDF document text
    • http://investmag.org/embassy_of_the_democratic_peoples_republic_of_korea_in_bangladesh9tepu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tifobegujetesa.rf.gd/nazos.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/lokafujifenezalalini.pdfIn PDF document text
    • http://safefimij.epizy.com/20508301490.pdfIn PDF document text
    • http://koxowideza.epizy.com/tijomorona.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DA 4816 bytes
SHA-256: 7012717f3151853241dfd1eeec63922b83c9b95ea61acde2eb18c8164716594f
font_01_sfnt_off00011135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11135 11044 bytes
SHA-256: f88b997b11f009e943d91d6659023ecd58e3e24672e17e151d2267915221ae36
font_02_sfnt_off00013711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13711 16388 bytes
SHA-256: 2cadb2ae25cea88cb182acc54f62d1c218aef5f2772c4081b94d5d3cddde1204

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