Malicious PDF — malware analysis report

Static analysis result for SHA-256 191b9d36794a1f27…

MALICIOUS

PDF

86.9 KB Created: 2021-03-23 19:46:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4736aa4863618ef71f296e871be59039 SHA-1: 2617331107f2f281be416c661c3f22b0fb968958 SHA-256: 191b9d36794a1f277475bb52571a4ca5be2732450bdfcf13bdd86d285b7438da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used for phishing or distributing further malware. The presence of external URIs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/strik?utm_term=compare+and+contrast+literary+definition PDF link annotation
    • http://cetly.xyz/lojobazezunexafmqarh.pdfIn PDF document text
    • http://frankkyko.com/79029369119wda6t.pdfIn PDF document text
    • http://zagejudivavi.sportsontheweb.net/sin_tu_amor_yo_soy_nada_in_english.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409814/normal_6006719343b04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402488/normal_6009a1d6ddf68.pdfIn PDF document text
    • http://easy-money-cash.space/zofamimegivuzed13k.pdfIn PDF document text
    • http://55571.ru/rejuleweximusisikj8qmy.pdfIn PDF document text
    • http://vilopeg.xyz/the_power_of_love_jennifer_rush_sheet_music1dwvy.pdfIn PDF document text
    • http://rafale.store/21812202892u9jsj.pdfIn PDF document text
    • http://sushibara.net/166738259653w4rz.pdfIn PDF document text
    • http://load-bcp.com/26630709637qu7yd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465703/normal_60402c3608d2e.pdfIn PDF document text
    • http://twirlini.com/kidurijilelutuxipitpfvq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_603fa84f1a0f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375357/normal_603c7cb699624.pdfIn PDF document text
    • http://wulutapebime.getenjoyment.net/zoduzerofug.pdfIn PDF document text
    • http://dressnbuy.com/how_to_use_time_management_effectivelydyr96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pomezup.epizy.com/jovup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eac5d6f-5d8b-4dd0-982a-f074202e4149/sevojanaserizupuride.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/045ce33f-0b29-4562-a5a0-d42d90c1bcd4/vector_spherical_harmonics_mathematica.pdfIn PDF document text
    • http://buloderijapu.epizy.com/unicef_deputy_executive_director_charlotte.pdfIn PDF document text
    • http://kavafaj.rf.gd/48132617512.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50b0bc75-ad05-481d-b2f2-2971ab434f10/43831891193.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_off000117e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E5 5308 bytes
SHA-256: 6dfe9dc00dea20a31e947f4bea47331bdb9875e1cb8acd30db7271d6a9cb796b
font_01_sfnt_off000129e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E0 10564 bytes
SHA-256: 91f5c3d99d538d8ad9a6a628f335b4bf8060ed02964f8174e4b54f4a01baa8a4

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