Malicious PDF — malware analysis report

Static analysis result for SHA-256 f987fa78a7b9eac1…

MALICIOUS

PDF

75.0 KB Created: 2021-03-22 03:09:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a589663345aa724ae3a4c690654ad3c6 SHA-1: 90f27264e43ad633e9710b27964c0722a537bcee SHA-256: f987fa78a7b9eac1f7efeb4067301bf440fb3d32e63609205fec3e3548b0ab3a
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://dafemum.ru/strik?utm_term=remington+electric+chain+saw PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402289/normal_5fe7ebd232091.pdfIn PDF document text
    • http://ufenmac.com/badeboxabz6toj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483836/normal_5ff22d9037588.pdfIn PDF document text
    • http://damvglaz2.xyz/what_are_the_objectives_of_social_scienceisqnu.pdfIn PDF document text
    • https://wanezevidika.weebly.com/uploads/1/3/4/5/134588498/5746732.pdfIn PDF document text
    • https://sazadasixitabe.weebly.com/uploads/1/3/4/4/134404720/tilesok.pdfIn PDF document text
    • http://solusaxisabo.scienceontheweb.net/lidewudujimegamukazevu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380209/normal_5fdda05f7ab27.pdfIn PDF document text
    • https://gositufojejuto.weebly.com/uploads/1/3/4/8/134890266/xagafu-nalise-fefijekavugalis.pdfIn PDF document text
    • http://slimerecipe.org/datofuzosowerilujutibekafd0dw.pdfIn PDF document text
    • http://netewe5.xyz/computer_science_dictionary_free6ih5m.pdfIn PDF document text
    • http://pinopizo.sportsontheweb.net/how_many_carbs_in_arbys_sweet_potato_waffle_fries.pdfIn PDF document text
    • http://topsalon.xyz/computer_organization_and_architecture_syllabus_ktux8018.pdfIn PDF document text
    • https://teriwogawuf.weebly.com/uploads/1/3/2/8/132815342/jifugikejobap-lopigulupejuf-ponetonitew-supogofisovef.pdfIn PDF document text
    • https://bapumora.weebly.com/uploads/1/3/2/7/132740837/2128629.pdfIn PDF document text
    • https://mafobosapufi.weebly.com/uploads/1/3/4/5/134505980/283424.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445868/normal_5febb05a39c7a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0095b4ff-f08d-469b-abcc-04af2381f280/76976769697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09312d35-0a8a-4f7f-888a-4eb6195c4406/how_to_start_yamaha_moto_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/306d327d-5179-424f-b37b-1761cfac7c9a/how_to_draw_eyes_simple.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/492cdbcc-95ea-4876-8347-7912175d1ea3/tactical_combat_casualty_care_card.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_off0000e61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61D 5312 bytes
SHA-256: f82508ee2e59de01d68d8f84441c2c27bc1dd876625029e06a280f62ef647c01
font_01_sfnt_off0000f812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF812 11536 bytes
SHA-256: 4c59f1700cccdc5957ccbf604b2a1adbfcb734a1bac6a4467e9f5075bced0c36

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