Malicious PDF — malware analysis report

Static analysis result for SHA-256 a087afc30f31e038…

MALICIOUS

PDF

93.2 KB Created: 2021-06-05 10:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 90eaa61e2402162164618df2394613bc SHA-1: e167a191d91875ffa5a8a7b27727f50c7ad34e08 SHA-256: a087afc30f31e038c9db07eec3f3cdfcd9803bc6b006fce7d315fac4eb79c222
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/123?utm_term=baahubali+songs++naa+songs.+com PDF link annotation
    • https://jotopivazujofid.weebly.com/uploads/1/3/4/8/134881135/benosetaw_gozed_zejafa_zigiv.pdfIn PDF document text
    • https://novizatedorik.weebly.com/uploads/1/3/6/0/136095988/33148125.pdfIn PDF document text
    • https://bijuxoku.weebly.com/uploads/1/3/4/9/134901677/2916068.pdfIn PDF document text
    • https://kavafarosodox.weebly.com/uploads/1/3/4/0/134097584/20429af1d8f7b.pdfIn PDF document text
    • https://vumeganutubaxo.weebly.com/uploads/1/3/1/4/131406578/wupagutuwadonusaru.pdfIn PDF document text
    • https://zefowuji.weebly.com/uploads/1/3/4/0/134096403/xarizipubus.pdfIn PDF document text
    • https://rozutedazo.weebly.com/uploads/1/3/4/6/134646396/a718e6.pdfIn PDF document text
    • https://rufuwoja.weebly.com/uploads/1/3/4/7/134735928/daduwipilufitirinaxu.pdfIn PDF document text
    • https://buxefakoxu.weebly.com/uploads/1/3/4/7/134744428/tesipefabosiweputuf.pdfIn PDF document text
    • https://xizotikozuza.weebly.com/uploads/1/3/4/5/134587863/pijatero_vigusiga.pdfIn PDF document text
    • https://xubedemowixur.weebly.com/uploads/1/3/6/0/136004279/nagesege.pdfIn PDF document text
    • https://vujivizu.weebly.com/uploads/1/3/5/3/135305207/jofaj.pdfIn PDF document text
    • https://nugizutotenit.weebly.com/uploads/1/3/4/5/134502776/dilakazibiri.pdfIn PDF document text
    • https://fusagepewaliwe.weebly.com/uploads/1/3/5/3/135325652/jazefowegujug_xubawalamipe.pdfIn PDF document text
    • https://pobapuzelikawe.weebly.com/uploads/1/3/0/7/130739661/3362839.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vawijoj.pbworks.com/f/cheat.db_zip_file_download_for_ppsspp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/830c067b-570e-44aa-af5f-06787238972c/21763716631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c9d4e69-8df0-46f1-bdea-bd9967445f02/how_to_connect_avatar_mini_smart_socket_to_alexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a59787e2-fca3-4a59-9f36-312a0c900e8c/pakelafig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f794974-4023-4a8b-b8b6-f21e23256da5/where_does_that_youtube_family_live.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8daa97ac-5950-42eb-b026-abc5d296bc09/gisedonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca6986fe-9c52-40fc-9565-23d0d561c679/22262043057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f721cae0-2548-4d50-9ee9-38a30a4541c5/samsung_rs261mdrs_ice_maker_reset_button.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9480e59b-9094-47f9-a06d-d5caccb90577/how_to_cook_a_whole_chicken_in_air_fryer_oven.pdfIn PDF document text
    • http://bezawagiga.pbworks.com/w/file/fetch/144559932/bathstore_shower_screen_installation_instructions.pdfIn PDF document text
    • http://finatin.pbworks.com/w/file/fetch/144500475/what_year_is_a_john_deere_lt155.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5033dd0b-5110-4296-bfe4-16fa2da3d1cd/ps_vita_games_not_on_ps4.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_off000131c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C5 5336 bytes
SHA-256: b8c0b6f20dafc450161a58e9c5c4dd767b8948a65076ea39be8593d3e94253c3
font_01_sfnt_off000143d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D1 10768 bytes
SHA-256: 3b9a5ac9bb708fd1176c727c7e2c6c0270d5d0c6b81f874c27ef15979c82d38e

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