Malicious PDF — malware analysis report

Static analysis result for SHA-256 91db2917075e9767…

MALICIOUS

PDF

80.5 KB Created: 2021-03-01 05:47:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 250e03d702142bb97bec0a15e7558241 SHA-1: e421e03828ec0a1552011b0691d4119d57280a0c SHA-256: 91db2917075e9767f94fbe8cb1b87ce62a542340414e0c028994496d6735ad1d
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous external links, many of which are suspicious. The document body, though partially corrupted, suggests a lure related to resetting a Casio watch, which is likely a pretext to drive users to malicious URLs. The presence of PDF_SEO_LINK_FARM heuristic indicates a large number of external links, potentially for SEO manipulation or to host various payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/strik?utm_term=how+to+reset+casio+watch PDF link annotation
    • https://vasirorikipik.weebly.com/uploads/1/3/0/7/130776585/dimemo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448986/normal_5fc82d0560f9d.pdfIn PDF document text
    • http://trysoda.pro/parawulukobijbu6us.pdfIn PDF document text
    • http://favodokoleti.mypressonline.com/how_to_install_rear_entertainment_system.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375531/normal_6025fadc2fcd8.pdfIn PDF document text
    • http://complerbnp.com/la_orestiada_analisiss14n4.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/dimitilugifajiwebuvox.pdfIn PDF document text
    • http://omerkatanalp.com/herbalism_guide_classic_wowb4wlt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366324/normal_5fcf9a17e3810.pdfIn PDF document text
    • https://vumazara.weebly.com/uploads/1/3/0/7/130738753/bijadedegeve.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nagev/tcp_port_scan_with_nmap_report.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/kametulebusuxam.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/47553479792.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/ccleaner_full_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/koviponevu.pdfIn PDF document text
    • https://s3.amazonaws.com/dafumuxitupav/62947087587.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/patazala.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 4588 bytes
SHA-256: 72e3f603e3ce4e28f93d62ac0a610ed03c7f3b52c51e80878caacbaefd56ce3e
font_01_sfnt_off00010296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 10524 bytes
SHA-256: 0cdc98b906b9a0937f9f55e885996507f4ba04349b5b3f67d75255ab070b595d
font_02_sfnt_off0001269f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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