Malicious PDF — malware analysis report

Static analysis result for SHA-256 7272c7d3a8c38516…

MALICIOUS

PDF

73.2 KB Created: 2021-06-13 23:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b5b16fb71e8db64acc802fb4911fdb14 SHA-1: fcca4b1458da7ce38caba7eec777ebd7c0276b11 SHA-256: 7272c7d3a8c38516e7164de0c3e94d240e3971d8ca18fe91118a623878716043
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://cructi.ru/pbw?utm_term=ceiling+fan+winding+turns+calculation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466364/normal_6069d1ebd278b.pdfIn PDF document text
    • https://dubelife.weebly.com/uploads/1/3/4/3/134379826/4371652.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383689/normal_6050e7d712755.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480895/normal_601233e633004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457577/normal_60bb819184a6c.pdfIn PDF document text
    • https://repositugi.weebly.com/uploads/1/3/0/7/130738607/xurala_suzukozunotat_vigemifumebuwag.pdfIn PDF document text
    • https://pujibotawajifuw.weebly.com/uploads/1/3/1/3/131379639/jasegetexuzasux.pdfIn PDF document text
    • https://jatazuleb.weebly.com/uploads/1/3/4/6/134662889/1d214cb9394155.pdfIn PDF document text
    • https://zudavarasosala.weebly.com/uploads/1/3/4/2/134266164/mikepa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412378/normal_5fcf4c7582a97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497370/normal_60395d647dfbe.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4379049/normal_60b1b6d7d81f7.pdfIn PDF document text
    • https://sezokifor.weebly.com/uploads/1/3/4/5/134596047/5507987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407724/normal_60c4f2684199f.pdfIn PDF document text
    • https://kenomixu.weebly.com/uploads/1/3/0/9/130969587/zuwaxena-bubazuna-suxiju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pudomasepok.pbworks.com/f/72856135892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47411493-3f6e-4f94-a162-8e0a7e24f47e/how_to_become_manager_at_amazon.pdfIn PDF document text
    • http://duriwug.pbworks.com/f/sefijetez.pdfIn PDF document text
    • http://ruwezebom.pbworks.com/f/49165409399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7312f643-36ff-47ea-88a1-7a4d899871f7/whats_the_lowest_calorie_food_at_taco_bell.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bee5a271-4018-4105-a8fd-745fce4a0849/best_skin_changer_fortnite_chapter_2_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2034c17-5e8c-44df-95f0-40df640f8698/pudatenujasosuketimefupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f10bf60-3610-4cb6-9c38-0d3755d3d836/peter_frampton_do_you_feel_like_i_do_lyrics_youtube.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_off0000e1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D2 5188 bytes
SHA-256: de3eae1481215aff47602d279c7e72dc67845f67a263996c63e3f69b46965087
font_01_sfnt_off0000f39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 10468 bytes
SHA-256: 8df7feafc9999aa0a46760c3e8a35a5f4b84b3bdc1ccd23d52e54b569afbcd16