Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc268849103ac93c…

MALICIOUS

PDF

79.4 KB Created: 2021-05-31 21:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6bff1dfb9b0c1cbe12f943345c9ac31f SHA-1: 9f981da43c060cd0cfa4d36f7c8cc29f901bca9c SHA-256: bc268849103ac93c6b98d8b34ded327cf036b49df2f800b3a39c5a8e5e99b605
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though partially corrupted, suggests a lure related to a book summary. The presence of numerous external URIs, including a link farm on disposable hosting, points towards an attempt to redirect users to malicious sites for phishing or malware delivery. No scripts were extracted, but the PDF structure itself contains embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://garglob.ru/pbw?utm_term=cien+a%25C3%25B1os+de+soledad+por+capitulos+resumen PDF link annotation
    • https://nitelozam.weebly.com/uploads/1/3/5/3/135308565/805de13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426413/normal_6028a544193e4.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4387706/normal_60afe3b899f18.pdfIn PDF document text
    • https://duzonaxur.weebly.com/uploads/1/3/4/0/134012347/nutobupo.pdfIn PDF document text
    • https://tumonejaw.weebly.com/uploads/1/3/6/0/136086042/3791423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389104/normal_603564ba87594.pdfIn PDF document text
    • https://xidekudogigut.weebly.com/uploads/1/3/4/6/134683706/f965a53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490974/normal_6068a2b9d6895.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410975/normal_5fedfbdcaab50.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/what_is_an_example_of_combined_variation.pdfIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144416151/troubleshooting_scansnap_s1300i.pdfIn PDF document text
    • http://garigor.pbworks.com/f/gizmo_answer_key_diffusion.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144411420/72258990565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c42d2f8-6a9b-48c2-b76c-02533b0beb37/nibapapezi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c8a4340-0c30-409a-b257-877268e76dec/what_is_the_purpose_of_differential_pressure_sensor.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144412134/99793606974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6178026-fb13-4a4e-a66b-3feef8f049ba/why_is_my_garbage_disposal_humming.pdfIn PDF document text
    • http://vawaguzidatu.pbworks.com/w/file/fetch/144423924/publication_manual_of_the_american_psychological_association_seventh_edition_2020_isbn.pdfIn PDF document text
    • http://dawijunegolo.pbworks.com/w/file/fetch/144422589/wugudomexerafesedekenusu.pdfIn PDF document text
    • http://jumedew.pbworks.com/w/file/fetch/144422616/bitzer_bse_170.pdfIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144411744/modunipe.pdfIn PDF document text
    • http://xalanupuzewo.pbworks.com/w/file/fetch/144419598/69222612279.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/nafibefived.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/55861045075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df1a225-4ab9-4c79-84a4-931db397cf4e/aeneid_book_6_latin_and_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3def75ac-29c0-4129-a627-da06a40cc623/peg_perego_john_deere_turf_tractor_parts.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_off0000eeb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB5 5336 bytes
SHA-256: 9d6f98759cf461f4ad4b2ad2ba050761b7fdf796f50303cd4a7dc5a925840f4d
font_01_sfnt_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00010903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10903 10496 bytes
SHA-256: 7c0fc294d7d8330b25a56477758e0c4ccb35a155f810890437509b4beba29b76