Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b01d842a50322ba…

MALICIOUS

PDF

87.1 KB Created: 2021-03-11 14:31:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 67f9d4836a4915ca4843b538da1c60fd SHA-1: e34cb69039565df066c51be6536d1b3dcf038670 SHA-256: 9b01d842a50322ba0380e55c2c18cebffcf85bd6756a42827eecc656889583ad
126 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing a large number of external links to other PDF documents hosted on various domains. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to manipulate search engine results or distribute further content. The presence of numerous external URIs, including those on disposable hosting, supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://jacksth.ru/award?keyword=thinking+with+type+pdf+free PDF link annotation
    • https://cdn.sqhk.co/pobusafi/rqogeVd/wasubefogovipujanovu.pdfIn PDF document text
    • https://cdn.sqhk.co/maxanogefo/27UhhxA/guideline_401k_login.pdfIn PDF document text
    • http://levantemosaic.com/30611268917gwmdk.pdfIn PDF document text
    • http://mizizufiku.mywebcommunity.org/body_systems_and_their_functions.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/hghjhgi/65112714825.pdfIn PDF document text
    • http://vezerfa.xyz/krystopia_a_puzzle_journey_mod_apki9yv2.pdfIn PDF document text
    • https://cdn.sqhk.co/divoxisig/jhXYhg1/sixanekisu.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/cuqhjhb/electric_guitar_parts_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/9HiiEEo/piano_kids_music_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/fopavege/koD8igj/kung_fu_panda_characters_voices.pdfIn PDF document text
    • http://leree4.club/rimitarudepuxofok1b7d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xifimerin.onlinewebshop.net/63341653300.pdfIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_8ff891a5ea89497a953c90d0b451be98.pdf?index=trueIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_ac27b53e78d348ae9ee10c67dfa82b28.pdf?index=trueIn PDF document text
    • http://gozuketitara.onlinewebshop.net/8755657292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fec353ba-773c-4dea-ab96-2c8e7f35ef81/pafilinikutenejogavebazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bcf0271-f21f-4f7b-929e-3c3db37bad18/harry_potter_1st_book_read_aloud.pdfIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_2904c6a9973e4a95bf747d5dadf07c91.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd938e70-8058-4d0b-9375-bfea8d824ac6/official_sat_study_guide_2020.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_off000118ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AB 5088 bytes
SHA-256: 0d62f2349351d2e4aa3b88e733daf4710b47f61afa4aa73c70b6ba27c010dd67
font_01_sfnt_off00012a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A16 10752 bytes
SHA-256: eb4bcc1768f9801cd8156573295d7d74071fa96d952d8d9b857e2d76ef272b20

Open this report in the interactive analyzer, or submit your own file for analysis.