Malicious PDF — malware analysis report

Static analysis result for SHA-256 3121133f2e912d45…

MALICIOUS

PDF

74.4 KB Created: 2021-03-31 22:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 94177308d997c6c0681e3beed048353d SHA-1: d5f23abffddbf5356d49e551ba07be249ea1b3c6 SHA-256: 3121133f2e912d455afcd677ac41b0b03a5d5b5d51deb76a6ffc49fb7473bc45
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and potentially malicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm on disposable hosting, likely to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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://xezojetit.ru/award?keyword=geometric+progression+pdf+download PDF link annotation
    • http://lightly.store/68903309389o21ki.pdfIn PDF document text
    • http://universal-kirov.ru/what_if_movie_2010_watchz8b96.pdfIn PDF document text
    • http://sunmarkt.ru/925078656594u5r1.pdfIn PDF document text
    • http://zovofuti.mygamesonline.org/sony_sa-wct150_remote.pdfIn PDF document text
    • http://timelessdecorum.com/asp.net_mvc_page_not_found2am4i.pdfIn PDF document text
    • http://kupivse.xyz/bollywood_songs_jukebox_mp3_download_2020rnj0l.pdfIn PDF document text
    • http://zhigina.ru/rokejukibuxuvo0cjet.pdfIn PDF document text
    • http://xagakojitogiva.getenjoyment.net/dozasa.pdfIn PDF document text
    • http://vkysnaya-eda.site/snugride_30_base_width33q8m.pdfIn PDF document text
    • http://tricitysikhs.com/3942297502jwuef.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xubaforan.epizy.com/gozipix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8dd826f-aea5-4835-abcb-27fb2b30e638/microbiology_notes_for_bsc_part_1.pdfIn PDF document text
    • http://wogurep.epizy.com/metal_bending_machine_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/the_tempest_themes.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/assassin_s_creed_identity_mod_apk_data.pdfIn PDF document text
    • http://gavoditi.epizy.com/25261835707.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/multivariate_data_analysis_in_practice_esbensen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/940d5b0c-0c07-480b-b04e-2b58e038be47/85428013660.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/venozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e916af68-a62f-448c-a45a-08f0663e3697/infantino_flip_baby_carrier_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc3ee2ed-2dcd-4ead-882c-f70a45e8de5c/95795155625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e78329fe-6809-498e-b39a-3329b73431d3/9616470037.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2C 1684 bytes
SHA-256: 4d3fb6748bdbfc0676bbc246a341b567ec3707c335db72ae26270b639488ab50
font_01_sfnt_off0000e290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE290 5596 bytes
SHA-256: 0a60036a2115a5e587e01a24646619a12ecd1539706929f15ac2490232b236c4
font_02_sfnt_off0000f59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59E 11104 bytes
SHA-256: 6dd2718eeae7093ce3a3bf10a712d6c9ae790ff4d9d19314390b6201268751f5

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