Malicious PDF — malware analysis report

Static analysis result for SHA-256 f542b13961fee0d6…

MALICIOUS

PDF

85.6 KB Created: 2021-03-22 20:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5c152284df9f87a729231bc45228d65d SHA-1: 5ddccd723bb039108b2be1fb8c2fb142ea0487cb SHA-256: f542b13961fee0d661c02fae6e95a9f58f5f2ef32e34721a0ec5af285a201332
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 0.9993

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://xezojetit.ru/award?keyword=genetic+algorithms+and+their+applications+pdf PDF link annotation
    • http://testersairf.xyz/kakopilojirbxqwp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406777/normal_5ff881639f084.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454967/normal_5fded5c8b754e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492272/normal_5fdeb74505147.pdfIn PDF document text
    • http://itravelgr.com/la_scoperta_dellamerica_pascarellaz8xeh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405430/normal_6035cdba2bad6.pdfIn PDF document text
    • https://surupipenip.weebly.com/uploads/1/3/1/8/131856971/1282947.pdfIn PDF document text
    • http://instapodarok.site/fifesoxujurosaxsdcyl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404293/normal_5febb51f5c28b.pdfIn PDF document text
    • https://kiteginizi.weebly.com/uploads/1/3/1/8/131871518/9354294.pdfIn PDF document text
    • http://agent-spv.space/82391886503edlfk.pdfIn PDF document text
    • http://shopsmmv.site/consecutive_integers_worksheet_with_answersk0wok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_8cae220f91554b8084c10d0fe09dabb1.pdf?index=trueIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_b89abeb04c0346ddac2fa827450e8eb6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c62064f-b078-4f4c-a4f9-d0268c9d4595/systems_engineering_principles_and_practice_second_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a85772a7-a09e-4cba-9d8d-ae76a3ff3108/black_and_decker_mini_fridge_controls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/442d2eac-a491-4048-b187-d8b6941f7e98/how_to_fix_a_weight_watchers_scale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cf3a6ee-bcbf-4a26-833d-0d6ed39002d3/verb_tense_worksheet_year_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/517fc71b-e9d6-47d3-bee5-a916d9adffe4/graphic_designer_job_salary_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f4c9234-5805-42f8-b0cf-9911a91b9a98/bermuda_monetary_authority_economic_balance_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6c06894-580a-45cf-94ec-4659a8365021/what_is_the_next_dog_man_book.pdfIn PDF document text
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_f2fb75109f844013bccc9978fd6813d6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/175ba0ef-1bdf-4d46-b6ac-7d0585e6d870/zara_and_hm_target_market.pdfIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_4edd10809f184c138423a94c476a2f1d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d5b4960-c81d-426c-a2c6-9988bc629631/72600579682.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_off000110c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C2 5600 bytes
SHA-256: 599aeb437b37e7680516803bc245f200a76fd38d08eaca6ebf1ec59961b7cb52
font_01_sfnt_off000123a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A8 11036 bytes
SHA-256: 23c8af057c92afee067fa0bade554d80aae038b8f144aa22337501cdb46d6826