Malicious PDF — malware analysis report

Static analysis result for SHA-256 f157e5c6a24969f6…

MALICIOUS

PDF

66.9 KB Created: 2021-02-26 18:43:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 8c3f7ac88cd2a6915e8dacd52746aa94 SHA-1: f0f5db285a81ba0c8dbf387d8a426fb408bdbe94 SHA-256: f157e5c6a24969f60ea96e89d7f780b9e8f46ebfc4af1f039e2686fae697c272
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful sites. The ClamAV detection and ML classifier strongly indicate malicious content, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or content-scraping attack pattern.

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 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://vilenefex.ru/wix?keyword=candy+drawing+images PDF link annotation
    • https://cdn.sqhk.co/xorilulog/ibNBXjf/gujinalivip.pdfIn PDF document text
    • https://cdn.sqhk.co/sunawopi/xiaTbge/16663251296.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/hWgcJwl/muwajivuw.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/ibiaEic/mobs_mod_minecraft.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485705/normal_5fe1d034c6857.pdfIn PDF document text
    • https://batoxomaziforu.weebly.com/uploads/1/3/4/7/134708014/6528911.pdfIn PDF document text
    • https://cdn.sqhk.co/noxawuge/jgxvIhe/dual_monitor_wall_mount_low_profile.pdfIn PDF document text
    • https://cdn.sqhk.co/zibusisujij/jif47hi/commander_legends_booster_box_price.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451744/normal_5fd78dc92df86.pdfIn PDF document text
    • https://cdn.sqhk.co/dusujukakal/Igjihhh/13560964259.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/paea_eor_family_medicine_study_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417653/normal_6015dba02f4bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413578/normal_60115f271c0bb.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/lazesej/effortless_power_english_free.pdfIn PDF document text
    • http://xakagigoneliv.myartsonline.com/65636048163.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/92461229544.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/agence_d_interim_informatique_lille.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/job_description_template_for_customer_service.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/ladijadorejen.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_off0000cb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB45 5212 bytes
SHA-256: da1bbdeac33842252db3186b141bd253aef3056365e7a5c6ecc9915c88bf568c
font_01_sfnt_off0000dcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFE 9892 bytes
SHA-256: 4ec09b5c45e7e88234f314d8799278d674be2c69a89605e591886de5ce67b4e1

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