Malicious PDF — malware analysis report

Static analysis result for SHA-256 534b64bf683f79a9…

MALICIOUS

PDF

72.8 KB Created: 2021-04-02 23:39:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d2ef0cbeeafac0d8ed722c9831add1a2 SHA-1: ea31a3b17b833931dd0907bb335bb5e3ee7bee9a SHA-256: 534b64bf683f79a9aee6871d3c9308d765b7dc5fae908324185dde72451c4b0e
186 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 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/123?utm_term=negative+indices+gcse+worksheet PDF link annotation
    • https://sopebanodi.weebly.com/uploads/1/3/4/0/134017095/3872561.pdfIn PDF document text
    • https://bukodagunotul.weebly.com/uploads/1/3/4/0/134012399/beberuxoxad.pdfIn PDF document text
    • https://togoxijagujeg.weebly.com/uploads/1/3/0/7/130775712/1720943.pdfIn PDF document text
    • https://keguvetazako.weebly.com/uploads/1/3/4/7/134702613/dakibijefil_lewipo.pdfIn PDF document text
    • https://xupijologa.weebly.com/uploads/1/3/5/3/135327862/sibidig_kanafiva.pdfIn PDF document text
    • https://guzajemifuraruv.weebly.com/uploads/1/3/0/8/130874286/xosis-vugifevip.pdfIn PDF document text
    • https://kimivatebuxokas.weebly.com/uploads/1/3/4/7/134702804/4720544.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420604/normal_6036822b8da78.pdfIn PDF document text
    • https://gekibuvun.weebly.com/uploads/1/3/4/3/134354697/7582109.pdfIn PDF document text
    • https://bunivuwavimi.weebly.com/uploads/1/3/4/7/134706582/temanuxifizowa_bawafepudutip_nudunejetavar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417662/normal_6034376a6e206.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/palikuvexake/macbeth_act_3_quiz_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14fac024-1240-4948-93aa-e1c05fbb61bc/88201085861.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/jackbox_fibbage_2_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7e0b453-7cc9-47a4-a881-cec52037e50f/what_technology_appears_on_the_royal_standard_of_ur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59968861-a11b-4184-b699-ed095386135b/98894991762.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/82474397148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03a84aac-f08c-4912-940b-32f27767d81e/evenflo_embrace_car_seat_base_installation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/067b661f-2d67-47d5-873e-2bbcbe5f728b/how_to_convert_jpg_to_on_macbook_air.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_off0000dc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8B 5356 bytes
SHA-256: da57a5cfefd5d3373a96e00c8aa2aa7dc06bbb5bb79e141796cbb1eb87f9e609
font_01_sfnt_off0000eed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED9 11420 bytes
SHA-256: 34e6d0e9b284e271c4b24d0309e16ae29fbdc40fcd2d3bef5eb5574e2bf24b08

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