Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a52a9377f4d7a34…

MALICIOUS

PDF

75.4 KB Created: 2021-04-19 09:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e5057785c4fb62376dcab6d6cf53f463 SHA-1: 531219bfe299954d81b2743ce121a41bc68b0211 SHA-256: 1a52a9377f4d7a340537aec1ad78bb168fa0e17d0920f5c980cd7e1fbf022ca3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://fokemale.ru/strik?utm_term=what+kind+of+work+does+a+mechanical+engineer+do PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387419/normal_602e21d84e5a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530990/normal_606ae9508f733.pdfIn PDF document text
    • http://wunadimizurened.medianewsonline.com/citi_costco_card_benefits.pdfIn PDF document text
    • http://mukinumatonewo.getenjoyment.net/blacksad_comic_espaol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416654/normal_5feed11c5bd86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409092/normal_5fc5ff6426edb.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/eddb4fbb-07e9-4c7b-bd0f-5bb7bde05a7c/what_is_radian_mode_on_calculator.pdfIn PDF document text
    • http://bexexakik.myartsonline.com/bugerolowupoxedebubajolo.pdfIn PDF document text
    • https://42f4b946-f871-4f2a-a73e-6571c6569919.filesusr.com/ugd/e20521_8ab4ff35f10a4ab29069056b64eb2074.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c8aa90b-52e7-4e72-a6ca-597d1d509f42/pefebufonukotiwotejasi.pdfIn PDF document text
    • http://fufuzadawefor.onlinewebshop.net/bebop_scale_piano.pdfIn PDF document text
    • https://c140f178-ee45-427e-91fe-a3c5f821f67e.filesusr.com/ugd/ebc5f9_1f22e4e2eafe4c22aef7300e13226105.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e4aebd4-fc82-48d1-b109-72830e134a42/dell_ultrasharp_u2415_monitor_driver_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/comparative_advantage_and_gains_from_trade_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/docker-machine_bash_ip_command_not_found.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7099af00-6983-4064-9e6a-fe928b7902c0/pete_the_cat_white_shoes_coloring_sheet.pdfIn PDF document text
    • http://rijemow.onlinewebshop.net/behaviouralism_in_political_science.pdfIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_d515c049f77a49409491aebabb1cfffc.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E5 5604 bytes
SHA-256: 1414db45cfdd97f1f7b3a32431ab76ab881f4778cd422e4d441a31fb10a8dd0b
font_01_sfnt_off0000fce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE8 10384 bytes
SHA-256: 6239910f97d5e4ce86fd13a08a3c109e2fbe4737c90b14b7019d8d0daed8909b

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