Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85f803a3a18d9a2…

MALICIOUS

PDF

67.9 KB Created: 2021-02-16 23:55:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c790ee27a73c93096cc316414227b9b3 SHA-1: dd43243b7342e25bdbc917781dbb16cd3a08942e SHA-256: b85f803a3a18d9a2f62b1c4e55c4f5fb2b226774b85eb062dde10cc5083bb317
156 Risk Score

Malware Insights

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

The file is a PDF containing a large number of external links, flagged as a 'PDF_SEO_LINK_FARM'. One of the primary external links points to 'baarspo.ru', which is likely a malicious domain used to host or redirect to further malicious content. The ClamAV detection and ML classifier also indicate maliciousness, suggesting this PDF is used as a lure or to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://baarspo.ru/wb?keyword=kayla%20itsines%20ab%20workout%20youtube PDF link annotation
    • https://cdn.sqhk.co/pabefidinaz/rymhgij/jlc_reverso_classic_medium_duetto.pdfIn PDF document text
    • http://joxorapux.22web.org/47470922175.pdfIn PDF document text
    • http://tobalalupuvobiv.iblogger.org/46645184046.pdfIn PDF document text
    • http://jonoxosu.iblogger.org/vishnu_bhagwan_photo_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/dxViaha/93889767276.pdfIn PDF document text
    • https://cdn.sqhk.co/menaleratupo/XA2hbja/defozikelimitu.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/firolesitepewe.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/CY1jhSU/98443580427.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/2igRjhv/black_screen_door_with_dog_door.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/perurulexi/96605175362.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/double_sided_adhesive_sheets_officeworks.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/web_browser_video_er_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/baahubali_movie_songs_free.pdfIn PDF document text
    • http://joxupabazifo.rf.gd/company_folder_structure_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/76305911651.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/fikenu.pdfIn PDF document text
    • http://navaradevopam.epizy.com/for_time_meaning_in_crossfit.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/jokuxixutijif.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_off0000cd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD05 5048 bytes
SHA-256: 71c18a848ec7b0f568ddbd661210359920fbb34816ff313acf9cc656aae28c19
font_01_sfnt_off0000de58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE58 10652 bytes
SHA-256: c4c5928ede544674ca0d152fb4616b32060ea88f6bf969c6b6394500631154f9

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