Malicious PDF — malware analysis report

Static analysis result for SHA-256 66dd7b6b45fd7925…

MALICIOUS

PDF

74.3 KB Created: 2021-04-29 20:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86a5815d9648070242af97fca3ad3d5b SHA-1: 567b4edd1f26207826999c3434d0ab0e8289cc47 SHA-256: 66dd7b6b45fd792578f018ebe6a3189e3eadb351b710d94dffb332ae9bb6ede8
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains embedded URLs, with one prominent URL being https://jottigo.ru/strik?utm_term=el+capital+marx+pdf+siglo+xxi, which appears to be a redirector for a phishing campaign. The document body, though heavily obfuscated, suggests a lure related to "El capital marx pdf siglo xxi".

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jottigo.ru/strik?utm_term=el+capital+marx+pdf+siglo+xxi
    • https://cdn-cms.f-static.net/uploads/4453142/normal_5fe874e1b0e73.pdf
    • https://static.s123-cdn-static.com/uploads/4387921/normal_5fe3c5f469bb4.pdf
    • https://cdn-cms.f-static.net/uploads/4490519/normal_6019675688422.pdf
    • https://cdn-cms.f-static.net/uploads/4366630/normal_60549271b175d.pdf
    • https://cdn-cms.f-static.net/uploads/4382976/normal_605d7d31377ae.pdf
    • https://static.s123-cdn-static.com/uploads/4387240/normal_5fdfdb79f2f40.pdf
    • https://static.s123-cdn-static.com/uploads/4407789/normal_6008628a06a5e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tewamenuve.rf.gd/bojabazumerutama.pdf
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_95e42f66932b4e23a9c23070d75f86ed.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3f0fc5f0-a9b8-4605-940f-6ae9df8e20bb/what_is_solar_energy_called.pdf
    • https://s3.amazonaws.com/medaliwifufugel/how_to_apply_fillet_in_autocad.pdf
    • https://s3.amazonaws.com/pavujiniz/jigeb.pdf
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_dc8b829fa2894eaebe2242b390ed8d75.pdf?index=true
    • http://bimumebuzof.epizy.com/1990_honda_hawk_gt_650_specs.pdf
    • https://uploads.strikinglycdn.com/files/631149f7-4b9b-414b-8201-372c5bd4af49/pajoj.pdf
    • http://mabomiwedetobew.epizy.com/jovejoxidutofasekobix.pdf
    • http://kulixuvomewono.epizy.com/canadian_food_guide_2019_for_toddlers.pdf
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_367725920ae244fd9ec89580ff1be295.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f4685920-f9f2-4733-aefd-20fddb333bc6/dr_sebi_mucus_free_diet_download.pdf
    • https://uploads.strikinglycdn.com/files/39df992d-ef7e-4852-8af9-4159d7a8e969/2005_dodge_grand_caravan_3.8l_alternator.pdf
    • https://uploads.strikinglycdn.com/files/2c943f19-28a6-4e36-81f1-505216f2a54d/best_dab_clock_radio_with_bluetooth.pdf
    • https://s3.amazonaws.com/megodipewukitoj/el_aprendiz_de_brujo.pdf
    • http://nabifasilazug.rf.gd/air_fryer_cookbook_free.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_off0000e425.bin
a30ef361c77e84e9b379adef2b992804ee8249ce21ce0543de6ec62bcab592e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE425 5500 bytes
font_01_sfnt_off0000f6d3.bin
ac2eb5e82b61c427d55e82c1878299f41926f98917721c196ef18e79c5677832		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D3 10844 bytes

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