Malicious PDF — malware analysis report

Static analysis result for SHA-256 10352c04159585a3…

MALICIOUS

PDF

74.9 KB Created: 2021-03-18 22:02:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 955fedd9902c08b723ce79ab5db0b93e SHA-1: d4e0ef8fa65a2126c48befa199c47f8da081ccba SHA-256: 10352c04159585a3bf4c178c7d5881ea0f3ae8050d75973f257ea3d7cef1ab11
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and 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 0.9990

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://jacksth.ru/strik?utm_term=what+kind+of+intermolecular+forces+does+so2+have PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4474979/normal_5fcf029ceb93e.pdfIn PDF document text
    • http://gedawuxofawu.iblogger.org/combining_sentences_with_subordinating_conjunctions_worksheets.pdfIn PDF document text
    • http://jokafoziber.22web.org/fopuniferugoduzedug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468819/normal_5fc858b9ae924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464315/normal_6030a51b39bd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503387/normal_5fd99e7748d9b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_280a5b031f1c45a1972de317d21f981e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f9596c3-1ba5-4eaf-b87a-5b9d6b92bbc6/38423858414.pdfIn PDF document text
    • http://zotijoxamofos.epizy.com/zaniluwijeluwonevilasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47046988-0625-4243-bf14-d7d287773f4a/little_prince_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10d6083d-728e-4cbd-b7cb-90fddb7ec4f3/44634627674.pdfIn PDF document text
    • http://faxanudof.epizy.com/barijefipo.pdfIn PDF document text
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_ec445e55bad94202a41b6804eebef037.pdf?index=trueIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_73920dd26cb341d3a913e28589f69112.pdf?index=trueIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_e95c2043a5dc48e4bd5b34a293ab7374.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39106457-633c-4b16-92cd-0539c988982e/17852261234.pdfIn PDF document text
    • http://ramamezez.rf.gd/ingenuity_convertme_swing-2-seat_-_candler_batteries.pdfIn PDF document text
    • http://juvemekexiki.rf.gd/bawotivikotike.pdfIn PDF document text
    • http://lugotimasowe.epizy.com/lofazukeriti.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/gout_cookbook_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/converting_units_of_measurement_mystery_picture_answers.pdfIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_c80422928dde4110b988aad915655ec4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/friendship_day_2019_photos_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/dixeradu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdc097dc-7cf2-4360-b159-23f0ea6a6e2e/58277579302.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_off0000e4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FF 5532 bytes
SHA-256: 21839e7f27fb20764d7bc1610077c081c7bb159ea45bd47c9220af982468c505
font_01_sfnt_off0000f7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B6 11052 bytes
SHA-256: 1b43e12245e8ae922e6f70345cf7542efea18ab4b1e6277416770be52a86df01