Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e4ba3e0080a0c3…

MALICIOUS

PDF

75.5 KB Created: 2021-04-18 01:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8bb2a84d236afe12ecae508c85ebc13b SHA-1: 327b0e7623c2453162ab8d556bab602cb6fc9fd8 SHA-256: 41e4ba3e0080a0c301b8d67e600514657b3bb299a0f15390e6f6c269b5894e9f
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy to obscure malicious links within a large number of redirects. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=security+analysis+and+portfolio+management+mcq+for+mba PDF link annotation
    • https://vipagavufedolaz.weebly.com/uploads/1/3/5/3/135350232/8408840.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/jP22ggb/47988772934.pdfIn PDF document text
    • http://openchambre.xyz/debodltnlk.pdfIn PDF document text
    • http://getsol.xyz/as9100_rev_d_gap_analysis_templatebwxnx.pdfIn PDF document text
    • http://crispyset.online/nuvowulezezobabitujepaky9xww.pdfIn PDF document text
    • http://natur-bio.space/digital_design_audio_dealers6hcx4.pdfIn PDF document text
    • https://biwawabagukolaz.weebly.com/uploads/1/3/4/7/134730268/nejukasudifik.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/traduction_en_anglais_de_balance_sheetqlylq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451231/normal_5fc6a1fc76919.pdfIn PDF document text
    • http://mestikon.online/wegotpnfex.pdfIn PDF document text
    • http://vinnipoh.space/sun_joe_xtream_pressure_washer6tmbp.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/jgdgrhi/world_war_2_countries_involved_map.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481423/normal_60435579de841.pdfIn PDF document text
    • https://zafaketikeduve.weebly.com/uploads/1/3/4/7/134704309/8333638.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/T1Ugj82/happy_halloween_2020_meme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_60486bd21cee8.pdfIn PDF document text
    • https://ropugobefele.weebly.com/uploads/1/3/4/4/134445072/kufifisewoma.pdfIn PDF document text
    • https://liwavijej.weebly.com/uploads/1/3/4/3/134379327/424b5498b6f4fdb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_4ed2bcea4eb946d7a93b4992357d7aae.pdf?index=trueIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_38fc6d6ef19e4e569d57127709128d7b.pdf?index=trueIn 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_off0000e6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D5 5944 bytes
SHA-256: 6a821d220735cf78f484523c929f25e5df7d961c615a74cbe9493a7c4421d4b9
font_01_sfnt_off0000faf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF5 11036 bytes
SHA-256: fdbe6c647f5d36e443eeb3e856fd4b87577510ccb8ebec772f41577456ac6fd3

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