Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27043f4c2a996a5…

MALICIOUS

PDF

74.2 KB Created: 2021-03-23 17:36:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 13f88bcfee25f4ea5cb09ca232570751 SHA-1: 9878cb508a8bf45a9b69f9f27c54f8bc06fa1d4f SHA-256: a27043f4c2a996a55701b543a2b2cb34f2cce5decf68e933aa0042ce2d68a940
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xezojetit.ru/strik?utm_term=is+value+investing+dead+in+india PDF link annotation
    • https://cdn.sqhk.co/vewukiziwemi/cgiDWhd/94003985959.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/jKihTWZ/download_game_draw_story_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/TghK4Qx/vokegifaxukegebufig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502268/normal_6026482bd0d2e.pdfIn PDF document text
    • https://cdn.sqhk.co/lutotilivik/ugcjhig/home_electrical_installation_design.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427274/normal_60417fa7ed8dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367905/normal_5ff88677b7d6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409394/normal_601db3069593a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457298/normal_6018f6d0ae23a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/bosch_exxcel_maxx_dishwasher_manual.pdfIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_5bf82a9af1af4e4ca7490e10ca2b460b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/cyber_security_awareness_campaign.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/ice_bofaml_global_high_yield_index_factsheet.pdfIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_84d0f0c2801644c5b4bd6db61e99827d.pdf?index=trueIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_183c86d8834b4398b2ea5ce6c488422d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/how_to_study_microbiology_medical_school.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/sudejepagesobidawoba.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/nhs_government_healthy_eating_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/metabolic_acidosis_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/memu_emulator_for_32_bit_pc.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_off0000e67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67E 4896 bytes
SHA-256: ffe1f65f63dfa60e55c03ba41ae3d937381a3a2a8ada95efa0a888b8ab0941cf
font_01_sfnt_off0000f740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 10772 bytes
SHA-256: 58a1aa45bf814b67d19ba0c6971df63fec091811b9cfed4e78fa27c72b146e21

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