Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f31c848e7fdc16…

MALICIOUS

PDF

79.7 KB Created: 2021-03-21 02:52:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 53a38edb3d925ab272f28617f1b4c796 SHA-1: 53a9fa059407109021c60e6b13d367cbca2dcfad SHA-256: 55f31c848e7fdc160dc906158c1c63e5f75b6661cac42dca6c4832fd73bfd03e
66 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 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 0.9991

Heuristics 4

  • 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://crophysi.ru/wix?keyword=whose+and+who%2527s+worksheet PDF link annotation
    • http://7gusevshop.space/belkin_n600_wifi_range_extender_setup6e29l.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/jhggjjC/dark_sword_2_mod_apk_1._0._4.pdfIn PDF document text
    • http://dmgameplan.com/89323391671s10xj.pdfIn PDF document text
    • http://tinesoxexi.22web.org/kezazeselufawaxegenebij.pdfIn PDF document text
    • https://cdn.sqhk.co/furaxofir/djeiZbu/voltage_drop_across_resistor_in_series_circuit.pdfIn PDF document text
    • http://migarosovimopem.22web.org/brazil_serie_a_stat_form_and_standings.pdfIn PDF document text
    • https://rimofunoduw.weebly.com/uploads/1/3/4/5/134525219/kawumige-disiw-dejabapaxiza-peronazurex.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/f3geiWf/76994634515.pdfIn PDF document text
    • https://zofisafewo.weebly.com/uploads/1/3/4/5/134508124/dutexovada.pdfIn PDF document text
    • http://timecodes.net/texas_dmv_vehicle_inspection_reportr2ajh.pdfIn PDF document text
    • https://roribevewo.weebly.com/uploads/1/3/4/5/134502196/bolofe.pdfIn PDF document text
    • http://marinarus.space/timojesunagagusakifexigqhbz.pdfIn PDF document text
    • http://kino-vezde.ru/55646417020jjjl1.pdfIn PDF document text
    • http://lunotikipadul.66ghz.com/surafivatilewekomalinen.pdfIn PDF document text
    • http://pet-guru.shop/36957453159vec4o.pdfIn PDF document text
    • http://itgermany.net/rudajapedemixitu2whao.pdfIn PDF document text
    • http://fosijez.22web.org/xajizudidapitexur.pdfIn PDF document text
    • https://cdn.sqhk.co/mesafovojifo/pjdhcLn/followers_tracker_for_instagram_app.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://uploads.strikinglycdn.com/files/a7ec760f-db97-43d9-a825-cf2af11fc6f5/how_accurate_is_omron_fat_loss_monitor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c92d7dea-de43-4bba-85fb-728bacf40871/74273005519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0bbe77f-485b-419e-9961-5286b61bfedc/lijifejap.pdfIn PDF document text
    • http://gotobixeg.rf.gd/abdullah_calan_kitaplar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebdabea2-bb03-4b40-92fd-194363f7dc98/temoxofejifo.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_off0000ee6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 4824 bytes
SHA-256: 1322e3433f8b3fe7e7d24f39f64bfdc3e518c4a37efcbe8aaabdfdabbf957e03
font_01_sfnt_off0000fed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 10568 bytes
SHA-256: 0b5ea00256acd369f11ef9e00c6d9f978f72ecd3b2c14a674b63a454ae1317d3
font_02_sfnt_off000122bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BC 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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