Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26bbdc1235b7e6c…

MALICIOUS

PDF

77.5 KB Created: 2021-03-12 00:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c4a4a2d829e81675f7f7d52b92a29556 SHA-1: 44e205757c7a80b4c2466678637b52bbdbe10c3a SHA-256: f26bbdc1235b7e6cc94c2000c5d41ba162841bb0579f7da2c2aa8abaa23d4cb7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lead users to potentially harmful content.

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://seumenha.ru/strik?utm_term=does+sony+bravia+have+hdr PDF link annotation
    • https://cdn.sqhk.co/kasunelebak/jnQCkji/virtual_piano_sheets_giorno_theme.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/hhuia5y/rocket_launch_live_coverage.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388158/normal_6007df40020ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463808/normal_5fcf50d168118.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/fAoihgj/votux.pdfIn PDF document text
    • http://xunarepozufuz.mygamesonline.org/bestiary_pathfinder.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488572/normal_5fd2dded3cf66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367642/normal_603d47454f145.pdfIn PDF document text
    • http://pedagodogiko.getenjoyment.net/how_do_i_get_my_original_birth_certificate_before_adoption.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/jolozidabi/take_3_tablets_once_daily_means.pdfIn PDF document text
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_49690a59470d447b832248c35250a15c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/cognitive_behavioral_therapy_worksheets_for_anxiety.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/88690135516.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/vakuwazojuditu.pdfIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_98394b97afe64df9b00cc7499d6dbe84.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/vujujipulorojuxopum.pdfIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_b78c80f3228544559efe52c33cb0092d.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8E 5184 bytes
SHA-256: b93d7022a36e381e45a1a38434fd95224bcba0f428feb71c6b59f1faa7376724
font_01_sfnt_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 10348 bytes
SHA-256: 850cfe8e39092d06f9fb94a507ef881f5ea8f3f9662770b3e693463376aa2259
font_02_sfnt_off0001140b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140B 16144 bytes
SHA-256: 18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b

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