Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a26606cb38fa2d…

MALICIOUS

PDF

72.7 KB Created: 2021-05-24 09:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 96873b3771df5777542dba04c6cf949a SHA-1: 7d11a07ddf9579184f839a62aaf3766996b0250f SHA-256: c4a26606cb38fa2d9cf4f6e76e336f97fd8a933cb38c5d2fa2414b12e1b4ee91
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to disposable hosting and some to known malicious redirectors. The ML classifier strongly indicates maliciousness. The primary function appears to be directing users to potentially harmful external sites, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/strik?utm_term=edecanes+de+lagrimita+y+costel+modelo In PDF document text
    • https://takotowi.weebly.com/uploads/1/3/4/3/134356266/jemime.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496597/normal_5fe6bf20bb892.pdfIn PDF document text
    • https://dubanivexog.weebly.com/uploads/1/3/4/3/134331992/3588876.pdfIn PDF document text
    • https://pafetujesotizi.weebly.com/uploads/1/3/5/3/135348857/velopole.pdfIn PDF document text
    • https://diwetipitas.weebly.com/uploads/1/3/5/3/135327042/kasedukamo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367308/normal_605b50c45c50e.pdfIn PDF document text
    • https://nupinowag.weebly.com/uploads/1/3/0/8/130814423/gupibawazafalem.pdfIn PDF document text
    • https://lifibopunikesi.weebly.com/uploads/1/3/3/9/133999807/lanelarufilusu_pijamunigoduko_zogupajus_gadibo.pdfIn PDF document text
    • https://vemowidododujev.weebly.com/uploads/1/3/4/3/134353566/pokasotesififilu.pdfIn PDF document text
    • https://limowidijepa.weebly.com/uploads/1/3/5/9/135992559/906ec.pdfIn PDF document text
    • https://gimogelego.weebly.com/uploads/1/3/4/6/134601730/7710347.pdfIn PDF document text
    • https://romenazojojeles.weebly.com/uploads/1/3/0/7/130775884/vapanibomerudeza.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/90a7410e-1c1f-43b7-a91e-30c72ef0ebd2/lexus_rx_350l_for_sale_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93a638f8-9d04-46d7-8be6-40bac344767e/concept_of_metrical_romance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dc87b18-dab7-4d9d-8b67-8d07061d17d5/nidijuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb3a20d6-5ad3-4f35-a910-0676c7b0acd0/93852912159.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50e6ee82-f2e1-480c-8115-8b18e0e49834/19358864931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3612cfb-f9ce-4441-8f05-df54546318c6/properties_of_exponents_khan_academy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b187acfb-a898-4bdd-9c76-c8a0defb2f88/how_hard_is_ib_math_aa_hl.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/android_robots_video.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/75497511639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e4149dc-f22a-4e8f-a0d0-db27f2f82a98/game_of_thrones_2021_planner.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/data_mart_report_meaning.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_off0000dd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD38 5316 bytes
SHA-256: 3b96393a4da106578152d4bbc67b87d2d7e1d51f34844a7c9b533002e15b954f
font_01_sfnt_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 11620 bytes
SHA-256: 284ac58db43736603ce1c507904f28b0faf15eebb7652a99785eaa2eb738230e