Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b8d7e30b355688…

MALICIOUS

PDF

75.3 KB Created: 2021-05-03 06:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: aeff7fe28e2431b0f391eda155aebc37 SHA-1: d9ff3337e8b992bb176078479835eeb5ee818c26 SHA-256: 32b8d7e30b3556889ecb610c91c0ac7ee4bcf7a45790b7746801c08a6929506f
186 Risk Score

Malware Insights

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

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 0.9992

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/strik?utm_term=advantages+and+disadvantages+of+think+pair+share+strategy PDF link annotation
    • http://pexarinolal.mypressonline.com/19147219590.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/maslach_burnout_inventory_franais_indonesia.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/factors_of_production_and_their_incomes_worksheet_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://01ff271a-2d66-4e22-ac0f-a796646d2f56.filesusr.com/ugd/8d93e9_b7a67f7061c1438d9e9348791754e879.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sezewu/79989364674.pdfIn PDF document text
    • https://8d537faf-e869-4ed9-a29f-988560fab1dc.filesusr.com/ugd/0cce51_cfbb4d99033c4310a0cd39b9ae45b403.pdf?index=trueIn PDF document text
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_c6c78b6521214348b78d5381c12c1088.pdf?index=trueIn PDF document text
    • https://63209029-b609-4f89-80e5-af59b408cdb4.filesusr.com/ugd/0713e6_7b406adbc19a44b29efa9a70ad2748c8.pdf?index=trueIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_e9ff3f0e78c146da8f1acbb5b27772fa.pdf?index=trueIn PDF document text
    • https://12c21f6a-324e-488c-af83-7e1076049286.filesusr.com/ugd/e84f25_d3fae91b93814271819fb5157b904444.pdf?index=trueIn PDF document text
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_3d1715e6680b4749b64b0de046403441.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nonabafat/response_essay_sample.pdfIn PDF document text
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_3ef24a5c31bc4ce4babc1cd08af23224.pdf?index=trueIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_48a483910d6a4c7b83eeaaacbaff5342.pdf?index=trueIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_54906fca831a49d894c52639618a3a7a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2494eb67-8011-4ef1-9ddb-545ebc610149/real_book_bb_volume_3.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/tonarusug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a09147a9-45fb-4402-901d-9bc3dc2afd17/evenflo_maestro_sport_booster_seat.pdfIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_4a9c3d4b35d147e7a47f28fdc2ccb49b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ebc2a50-a7f2-4322-b2fa-66ae9e8c893e/philips_shaver_9000_cleaning.pdfIn PDF document text
    • https://f5d5bca3-0ffd-41e3-a77d-3d805a1e43e5.filesusr.com/ugd/4e23ca_8431050e03f4480ab76d7d691b6da031.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/58fd5add-e45d-4b7d-8907-a0c05f1613cd/a_package_for_mrs._jewls_worksheets.pdfIn PDF document text
    • https://041c2bdd-267b-4995-9d72-d071cf2c2b2b.filesusr.com/ugd/ba0b69_32e3ce8cfea14500891242107bc1cfcd.pdf?index=trueIn 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_off0000e7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 5484 bytes
SHA-256: 73a2121912633ed9dca92d6637d7ae7de3a0321b246c83f3672436a41095990e
font_01_sfnt_off0000fa68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA68 10928 bytes
SHA-256: d3e908311a9681713872734e0472d2771e2a408c82fa3c510c7664a79bab5be6