Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8098b4b81d7aad5…

MALICIOUS

PDF

80.0 KB Created: 2021-04-06 07:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 213c52d25341d28c0b2e491366ce9c13 SHA-1: 945ccb059430f9fba735e93a0bda79f96d71a0b1 SHA-256: d8098b4b81d7aad50b986fc8aed4ec2e6cbee60a7baf24c1c474c018abd1836c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://gimoguvi.ru/wix?keyword=android+apk+emulator+windows+10 PDF link annotation
    • http://pimebujeben.66ghz.com/17612150131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368243/normal_6016659193150.pdfIn PDF document text
    • https://kuvomudoriri.weebly.com/uploads/1/3/1/4/131406544/xovajuvojevejukoju.pdfIn PDF document text
    • http://zolijava.iblogger.org/blogspot_libros_juveniles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389127/normal_6011c72e72b0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446944/normal_60184789f0298.pdfIn PDF document text
    • https://nagafibujur.weebly.com/uploads/1/3/4/5/134514283/8877921.pdfIn PDF document text
    • https://lixazasowab.weebly.com/uploads/1/3/4/5/134588429/selenujafoxibo-nexexujekanutak-vewebup-baxegeki.pdfIn PDF document text
    • http://fodagikegabafak.iblogger.org/mrityunjay_marathi_kadambari_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/33359816993.pdfIn PDF document text
    • http://rodobokojezaga.epizy.com/pimobovileve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/029afcdb-446c-4948-99f0-d99195f5b7f0/brother_mfc_8950dw_fuser.pdfIn PDF document text
    • http://fipamopiwip.epizy.com/22544221389.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/apa_essay_format_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b46cc6d5-c7cb-4f17-9130-07600cde78cf/samsung_galaxy_tablet_ce0168_charger.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/69711242446.pdfIn PDF document text
    • http://kugibujupedo.rf.gd/nightcore_hometown_smile_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f25fa54-4105-467c-90e5-83ae9d6f47f9/all_my_sons_moving__storage_of_dallas_llc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08881a4d-eb5b-4535-bd7c-1a32ba759cf2/developmental_milestones_for_12-24_months.pdfIn PDF document text
    • http://xuwiviw.rf.gd/bicolano_dictionary.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_off0000fafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFE 5444 bytes
SHA-256: b0ff002ab3aee88297260ee323831ac8029e4592926ada0812390425938a4503
font_01_sfnt_off00010d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D84 11112 bytes
SHA-256: 5721111195921d00e0c408cfc987ec60407c442894fac0b2a60a7b63e4a67432

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