Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1b9cbdde3427e4…

MALICIOUS

PDF

79.2 KB Created: 2021-06-07 03:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6a27ce25932b250c4ed42ef6cd577875 SHA-1: 2166ca0a0bb5f20370d5f014cfe21cd73eb53881 SHA-256: bb1b9cbdde3427e445f2883a7bf86fbe82af3f2124db81bddd60815894289712
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports a malicious intent to redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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://crewmak.ru/pbw?utm_term=esquadrao+suicida+online+completo+legendado PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414678/normal_6013bdbd7c220.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4416144/normal_60b2f4841057a.pdfIn PDF document text
    • https://nitavadokeja.weebly.com/uploads/1/3/1/1/131163909/miwolizurunugev.pdfIn PDF document text
    • https://zelapagetuwuj.weebly.com/uploads/1/3/1/4/131406140/voliz.pdfIn PDF document text
    • https://bategasef.weebly.com/uploads/1/3/2/7/132712490/df1f47b8ba0a36e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379230/normal_604b044e2fe9e.pdfIn PDF document text
    • https://nokajaxupi.weebly.com/uploads/1/3/4/7/134715681/jomikenaz_torebaji_fizulewuvoze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392656/normal_6020fa6a5dde2.pdfIn PDF document text
    • https://depularo.weebly.com/uploads/1/3/4/6/134601330/xofawuziwum_gutudore.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wigiwopajuke.pbworks.com/f/old_hindi_songs_ringtones_free_download_mp3_zip_file.pdfIn PDF document text
    • http://mujusevo.pbworks.com/w/file/fetch/144575805/what_is_doctrine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67598ca6-6eb8-43b6-b0cb-6507c88d7ea9/alita_battle_angel_anime_movie_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c8e21a9-8b93-434c-90f3-2dd04aedcf7d/dapanomokawotulezesiwina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/378fd2a3-e203-4949-9feb-c76c5769d630/lenufobaxurubivep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7955c2c5-216e-4384-9305-7754f20e1a53/the_way_we_review_now.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5ed77d2-d67a-4764-b2f3-2f28780f09e4/is_there_a_girlboss_season_2.pdfIn PDF document text
    • http://garigor.pbworks.com/w/file/fetch/144425415/9855918595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9c642aa-c809-4ac5-b08b-3b3b5f1d47e6/fubov.pdfIn PDF document text
    • http://gitefov.pbworks.com/w/file/fetch/144687834/14372173588.pdfIn PDF document text
    • http://xodelow.pbworks.com/w/file/fetch/144643857/fijepojepaxek.pdfIn PDF document text
    • http://mupalunava.pbworks.com/w/file/fetch/144674424/jackal_and_hyde_song_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fbc84ee-e5d9-4b6c-8e81-44a69cb65917/fatonikuro.pdfIn PDF document text
    • http://fevawigo.pbworks.com/f/6667158432.pdfIn PDF document text
    • http://pisaxolakek.pbworks.com/w/file/fetch/144721023/48059728706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5819fd63-ee73-4a75-b322-487b6a3d4c04/81172114374.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_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 5476 bytes
SHA-256: 8081a2e4651a443e4876281e9acbdfca7a10d7a79408ef54ac7dd1b055f39296
font_01_sfnt_off000106a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A0 12680 bytes
SHA-256: 1e508e798ab2286d0eec926f09eed0f03362d90965e0cb89c77b1eca05d5d95d