Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f90cfdfa20f300c…

MALICIOUS

PDF

73.5 KB Created: 2021-03-13 22:02:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b83168d3fa1aa143e71a8cb80e6daee5 SHA-1: 2073f8860e7b77a109d16e08a32a7913befed73f SHA-256: 8f90cfdfa20f300c26e6d02b0c2db85ff1ff394ba86f185c620977ba2d9d69d6
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 0.9997

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://xajibur.ru/wix?keyword=gmc+owners+manual+case PDF link annotation
    • http://zinusefubowewet.22web.org/rojabobexubi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gatinilub.epizy.com/what_are_glue_traps_for_mice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/662e5ec4-0914-47e8-871a-05235dc805fc/bolens_lawn_tractor_parts_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3996cc76-5b07-4dc4-a4a8-ce88b64e003c/free_willy_un_amico_da_salvare_streaming_ita.pdfIn PDF document text
    • http://xilegep.epizy.com/88267499547.pdfIn PDF document text
    • http://buzanone.epizy.com/artificial_sweeteners_and_diabetes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edde865b-efd4-452c-a406-ba2c6da7d221/51027526878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fa9be1b-7242-4440-b9d9-f771f96cf78a/i_was_quiet_but_not_blind_meaning.pdfIn PDF document text
    • http://fokoxowikelejex.rf.gd/pozukulivipeke.pdfIn PDF document text
    • http://jogukazulani.epizy.com/como_ser_un_lider_efectivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5a3b4ee-44da-42e8-a5a6-40fb69300e62/xbox_gold_trial_code_2019.pdfIn PDF document text
    • http://kibulirol.rf.gd/78278717788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ff2f092-a3d2-4981-a6d8-4a9ea8536569/32775754917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2a504d4-6448-49e3-b479-8899c173fa14/how_he_loves_us_lyrics_flyleaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/becac619-0b8c-40dc-a159-e3a701d5b302/is_ahsoka_tano_in_episode_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8592e96-84f7-4e12-83e9-0f8a6dd6d219/fikupiwurufat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8de3c111-e18b-4190-b8c5-bb1ce8d1da34/oregon_chainsaw_chain_for_husqvarna_460_rancher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1518ba48-1417-463d-8a3e-518c552a6ad2/what_do_you_call_a_very_sensitive_person.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc9ed563-20d9-4029-b10e-e8efece2ba20/famous_quotes_diary_of_anne_frank.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21ba0f06-62cb-4765-9e6a-5b00deb24f8f/33261077277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df9ab284-0294-45d7-97dd-205d34abae6e/60990081234.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_off0000df5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5B 5068 bytes
SHA-256: a39bc74288dea25f88575d7eefc443694c51b7f21bcdfd51faefc31704755491
font_01_sfnt_off0000f091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 11392 bytes
SHA-256: 1a2fd045eafd1d7e911ccd96f14553d2b715e7eab7e562ee864ee0f0e4f5be46

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