Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba947a3c47bb4ce6…

MALICIOUS

PDF

78.0 KB Created: 2021-02-14 14:28:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5c6580c8962c62d67c49311b01276477 SHA-1: 73aae63c212dbd441a58c73184b3e3f53e6d99a4 SHA-256: ba947a3c47bb4ce63f3ecf643c316f4adc0f409d0539325c80fe59d115b81270
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. The primary attack pattern involves directing users to numerous external URLs hosted on various domains, including disposable ones.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://jottigo.ru/wix?keyword=art+history+101+study+guide+pdf PDF link annotation
    • https://cdn.sqhk.co/gozigawefo/Dhaia8V/netflix_vr_app_ios.pdfIn PDF document text
    • https://vufuredupe.weebly.com/uploads/1/3/0/7/130776381/xesakazunofep-wiximalerowan-faguj.pdfIn PDF document text
    • https://cdn.sqhk.co/xidupesijij/Mhhjiij/nabijubesawugakowebezipuz.pdfIn PDF document text
    • https://fitadidexedas.weebly.com/uploads/1/3/5/9/135977916/223b7fa27a95df9.pdfIn PDF document text
    • https://cdn.sqhk.co/zobelekivix/qibjejj/basketball_world_rio_2016_usa_team.pdfIn PDF document text
    • https://wivexisi.weebly.com/uploads/1/3/1/0/131070498/26977413.pdfIn PDF document text
    • https://kipowiginudi.weebly.com/uploads/1/3/1/3/131383469/2712718.pdfIn PDF document text
    • https://cdn.sqhk.co/luvunugoz/fhdGGjf/lekoluwipumu.pdfIn PDF document text
    • https://cdn.sqhk.co/mezugifosa/igdighj/3128664512.pdfIn PDF document text
    • https://fimudelowuj.weebly.com/uploads/1/3/1/4/131455024/b81f47f373ac.pdfIn PDF document text
    • https://cdn.sqhk.co/wujejelot/Prieqgg/75693762965.pdfIn PDF document text
    • https://cdn.sqhk.co/tokititagiwe/dYgdZgj/70333781314.pdfIn PDF document text
    • http://vadusulu.iblogger.org/articles_of_faith_lds.pdfIn PDF document text
    • https://cdn.sqhk.co/mavixuwaloz/jihgggg/tozadutagapudem.pdfIn PDF document text
    • https://cdn.sqhk.co/wofunukasu/QjapYjb/read_sheet_music_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kifemulawej.epizy.com/alternative_to_android_messages.pdfIn PDF document text
    • http://fozosoripivo.epizy.com/19403660312.pdfIn PDF document text
    • http://temipaz.epizy.com/raterovunuwusasevizo.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/41229278149.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/87801182504.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/ajax_beginform_example_mvc_4.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/sumitomo_cable_catalog.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/wosobizaxixosunibob.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/chorale_from_jupiter_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/89022755884.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_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 5348 bytes
SHA-256: 978635d395fd8d72880ba15fe4b1a5f03a2710306516a6a31e921af2857b1043
font_01_sfnt_off0001060d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060D 10500 bytes
SHA-256: 25e70c92e60f641846bac76fd669ff03b3c15a3da62efe70957c55595a780751