Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a88816cd79a34e…

MALICIOUS

PDF

69.4 KB Created: 2020-12-11 19:45:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 7408f59f721cbbaa9548a23e3567e280 SHA-1: 90e9a361bad71e7aa771df215373c5ea88f50ecb SHA-256: 88a88816cd79a34e44dc28cd5bd97c3a746678e461fe30117ff9a0a43ab0a6ef
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 0.9998

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://trafffe.ru/strik?utm_term=maplestory+2+priest+leveling+guide PDF link annotation
    • https://xawuwotogot.weebly.com/uploads/1/3/2/6/132695388/nijade_katonexabokaj_mavol.pdfIn PDF document text
    • https://zitidatuviwe.weebly.com/uploads/1/3/4/4/134493200/7459363.pdfIn PDF document text
    • https://xumebarukez.weebly.com/uploads/1/3/4/6/134687090/8526773.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b3d3248-63da-44d3-8a8f-661859c02375/62897810069.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/safanedan.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/formato_de_agenda_escolar_para_imprimir.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/danilawuzajowadajedebidez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dce81146-ae6c-46b6-85e6-1690beb75991/10_second_challenge_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/wasalefobup.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc365b22e34347c70542066/t/5fc4ef214e98326c02abec2e/1606741794241/bezuzunupowupukelivug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3e0b24e-1ced-4baa-a6a0-d599d34fb095/definamewilasijoludetapa.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/social_enterprise_business_plan_template.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_off0000d191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD191 5428 bytes
SHA-256: 78cf0499d7e6b01c5de8dcc6ea0f0fa741509f46cdda9b2af71d9b5fca6152d3
font_01_sfnt_off0000e430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE430 10696 bytes
SHA-256: 36bb0753d8a4437ff3a91e404ddb306887e7f73d292e085ccf7b4c0b5b048f35

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