Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5877bbdd634d885…

MALICIOUS

PDF

103.3 KB Created: 2021-03-23 08:35:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33e428d5331006e75c774104fc3f404b SHA-1: 346d4a002eecfb418d291a7fabf17cb2f6fd9af6 SHA-256: c5877bbdd634d8859dd5a027b7c12d0a704e20c23ac5cedd289f30d87a774df9
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains numerous embedded URLs that redirect to a link farm, suggesting a phishing or scam attempt. The presence of external URIs and the link farm heuristic strongly indicate an attempt to redirect the user to malicious or deceptive content.

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://leonvi.ru/strik?utm_term=what+degree+do+you+need+to+be+a+public+relations+manager
    • https://libadelalisam.weebly.com/uploads/1/3/4/5/134579317/visogejerimudoza.pdf
    • https://gidigodojuk.weebly.com/uploads/1/3/0/8/130874472/7336884.pdf
    • https://cdn-cms.f-static.net/uploads/4368477/normal_6046b827e55e5.pdf
    • https://cdn-cms.f-static.net/uploads/4460972/normal_60354f1f7a386.pdf
    • https://static.s123-cdn-static.com/uploads/4384325/normal_5fc62f25f132d.pdf
    • https://cdn-cms.f-static.net/uploads/4450878/normal_6057de37d3117.pdf
    • http://nonly.xyz/2576746366517316.pdf
    • https://static.s123-cdn-static.com/uploads/4402717/normal_600517949d20a.pdf
    • http://urro-hu.com/26265478067t3haz.pdf
    • https://raguwagoneneza.weebly.com/uploads/1/3/1/3/131384547/8432057.pdf
    • http://mesretly.xyz/sagobofakukugojonitubbu18k.pdf
    • http://velesvoyage.ru/chins_petition_form_massachusettsz3cdd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://dexedigobejo.rf.gd/synonyms_and_antonyms_words_list.pdf
    • https://s3.amazonaws.com/tikofaketonub/maximum_principal_strain_theory_wikipedia.pdf
    • http://fakeloj.rf.gd/2736621246.pdf
    • https://s3.amazonaws.com/jenagubadopi/whatsapp_plus_iphone_link.pdf
    • https://s3.amazonaws.com/janodojivi/7262919284.pdf
    • http://mivezemobopu.rf.gd/lonely_planet_turkey_guide.pdf
    • https://s3.amazonaws.com/xonaxevetaf/residential_lease_agreement_format_in_tamil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001492b.bin
482bcbcca530f37f055a9119ae837710a83290fa9896c7447e5aadb8ca4f749e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1492B 5624 bytes
font_01_sfnt_off00015c23.bin
16cab59be81cf1fe89cb0e405cc2b2b69d7582ff2a84e0e9498eb8ab7a75d3d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C23 10996 bytes
font_02_sfnt_off0001816e.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1816E 4324 bytes

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