Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1595cff87688789…

MALICIOUS

PDF

81.5 KB Created: 2021-03-07 09:57:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7e97ac5833d0f02783b8a3d7e347fac0 SHA-1: 7990606f4e7c65cb24b071a1481350158aaeb879 SHA-256: c1595cff876887891bb0d187dbff99d4cb66ec7f79822d2087cd94a567f51f38
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this finding. No scripts were extracted, but the PDF structure itself is indicative of a link farm or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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://fokemale.ru/strik?utm_term=how+to+clean+a+briggs+and+stratton+snowblower+carburetor PDF link annotation
    • https://kokilanoru.weebly.com/uploads/1/3/4/0/134012510/kiwiza.pdfIn PDF document text
    • http://fionainthefield.org/rise_of_the_argonauts_pc_reviewy0f4b.pdfIn PDF document text
    • http://wspring.space/zorimorigenigujujawovaga0pr3w.pdfIn PDF document text
    • https://fopozawiluni.weebly.com/uploads/1/3/4/3/134383369/tusemazamulaj.pdfIn PDF document text
    • http://rabizepafuxonag.mypressonline.com/38698340029.pdfIn PDF document text
    • http://siteznakomstv69.space/kanukutelexarumiredazgcu2f.pdfIn PDF document text
    • http://nupewijanetari.medianewsonline.com/software_development_manager_salary_per_hour.pdfIn PDF document text
    • http://vasakuso.sportsontheweb.net/what_causes_permanent_acid_reflux.pdfIn PDF document text
    • https://zajoralesame.weebly.com/uploads/1/3/0/9/130969459/fojinino-sitojusutiduwad-bufowakivebop-lelov.pdfIn PDF document text
    • https://pamukisap.weebly.com/uploads/1/3/4/7/134761215/mesusimudomamo-nevusa-dabaw-welibajusujop.pdfIn PDF document text
    • https://vorufiduwesonuf.weebly.com/uploads/1/3/5/3/135314955/vimaveduzikowaj.pdfIn PDF document text
    • http://letilemugemin.66ghz.com/what_is_the_highest_paid_security_job.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/matogapibelifiv/95984952943.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/74117441856.pdfIn PDF document text
    • http://bavevex.onlinewebshop.net/74266830175.pdfIn PDF document text
    • http://dixadenidufudu.epizy.com/92176805322.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/akai_professional_apc40_mkii_manual.pdfIn PDF document text
    • http://vetuwuw.epizy.com/gurps_4_character_creation.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/definition_of_dotted_line_reporting.pdfIn PDF document text
    • http://bupizakeluv.epizy.com/dagapejisekenupej.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/lamborghini_chalai_jande_ho_song_video.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/36754421327.pdfIn PDF document text
    • http://lewinozed.atwebpages.com/proakis_digital_signal_processing_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/calc_bc_frq_scoring_guidelines.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_off0001003c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003C 5300 bytes
SHA-256: 81b7b7ad569f26d2bc31bbee99b4b8377328dd23979abe51e1d066a6094113bb
font_01_sfnt_off00011256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11256 10932 bytes
SHA-256: 74ff33467cb0c5ccdc0498134908477557721dbc6e105dfb53611b6bf0599e86

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