Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a1c92fdfeed6ea…

MALICIOUS

PDF

80.0 KB Created: 2021-05-01 11:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d052cd3ad4070be1a4f1fffe33c5e2a2 SHA-1: b0f70217a8134b86126de269a236f54443a669d7 SHA-256: 26a1c92fdfeed6ea60f66beeaac830f74ee06c4ac2833f479a069775522042f1
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://vilenefex.ru/strik?utm_term=what+does+a+social+worker+do+in+foster+care PDF link annotation
    • http://eurosett.net/what_states_offer_paid_parental_leavek5cde.pdfIn PDF document text
    • http://bisituz.sportsontheweb.net/nemalinogemukamipijo.pdfIn PDF document text
    • http://rinusiwujegabu.medianewsonline.com/93721061133.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/toroxetisapofi0rav4.pdfIn PDF document text
    • http://nelolizavulejuj.medianewsonline.com/atomistique_smpc_s1.pdfIn PDF document text
    • http://copyright-services-us.com/54189578568mysa4.pdfIn PDF document text
    • http://blockhcain.host/vikomedaxutmvo7o.pdfIn PDF document text
    • http://mazers.fun/how_would_you_describe_the_moonlight_sonata_on_piano5iwhv.pdfIn PDF document text
    • http://qupieasy.online/69585245049fwfwc.pdfIn PDF document text
    • http://qiwi-wallet.online/csv_file_from_s3_bucket_javaoqmo9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vaniginisawiv.rf.gd/5468773275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a19b753c-ebba-432e-a50f-d91457b1c3b0/why_should_i_read_diary_of_a_wimpy_kid.pdfIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_b7f6fe294e2b45a5b3e58bbc1c6f1ba7.pdf?index=trueIn PDF document text
    • https://2b01876c-5741-4e94-bfb6-30973e4a6517.filesusr.com/ugd/45d688_c166ddac4f0147389326c601e15d7be9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f13ee8e7-56e4-4a07-b078-abf5f6f2b88c/double_down_meaning.pdfIn PDF document text
    • http://rapuxatidugek.epizy.com/how_to_charge_seiko_solar_watches.pdfIn PDF document text
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_210db6de8c6448c6bf45038caff73610.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f4a3319-0501-45b6-aaff-85bb3cda7851/8472106287.pdfIn PDF document text
    • http://negamew.rf.gd/95768730425.pdfIn PDF document text
    • http://kavibajegis.onlinewebshop.net/67899913236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69014d33-e92e-4d6f-acdf-94e50bdb5059/4656483179.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_off0000fa6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6C 5280 bytes
SHA-256: 41dbc149d701f139724e38dcd4af3228d26d2d10b0114b68e28c62bbbf57dc36
font_01_sfnt_off00010c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C75 11116 bytes
SHA-256: fc3950efd2374b1f0df2c83da5b542fb37639e84fe4a03c49480eeafca3a42db

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