Malicious PDF — malware analysis report

Static analysis result for SHA-256 7710a49fe08c743b…

MALICIOUS

PDF

76.6 KB Created: 2021-03-16 08:55:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0806815540edc13d812b85ce9625e11d SHA-1: 910a35d19e309d55e74839fb8905bd25a4eccdef SHA-256: 7710a49fe08c743b11be510cf35e9366ddf66e9160954e2e0b44ae45feb76d33
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, pointing towards a phishing or malware distribution scheme. The embedded URL 'https://pelibifir.ru/infin?keyword=belajar+membaca+untuk+anak+tk+pdf' and other similar URLs found in the document body and heuristics are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/infin?keyword=belajar+membaca+untuk+anak+tk+pdf PDF link annotation
    • http://santand-es.com/74458687921nup0g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383924/normal_603bd52d3bcbe.pdfIn PDF document text
    • http://centerverifybadge.com/vavuxumadebaxubaxebj2h0d.pdfIn PDF document text
    • http://organicnu.info/clavicula_salomonis_key_of_solomonc7phg.pdfIn PDF document text
    • http://energytik.net/51016558866solf7.pdfIn PDF document text
    • http://dhl-order.info/openoffice_graphics_editorw007b.pdfIn PDF document text
    • http://dezlice.ru/71369382224nh235.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417129/normal_600301de8659c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385202/normal_6041ec5be7ef0.pdfIn PDF document text
    • http://letxxnx.org/mcgraw_hill_ap_world_history_online_textbookq569z.pdfIn PDF document text
    • http://yewes.space/sotajuj1c4t.pdfIn PDF document text
    • http://dorightschool.com/formation_des_accoucheuses_traditionnelles8zq6h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401982/normal_5fd06f8eea568.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419628/normal_5fd1612b004b2.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/df0ab3e8-356a-43b9-80dc-889e7e7dab9f/how_to_factory_reset_disabled_iphone_4_without_computer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a204ea3-7949-4756-af54-48a136892ea5/sony_ps-lx300_belt_drive_turntable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ee8c732-4ae8-45a0-aacd-1d9d03f7bee8/84057617469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1dd1070-6101-43f6-a0a6-5785934a52be/482050661.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25cd7e27-7c8f-461a-9028-fb35c681a668/what_is_a_zero_waste_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5f46896-2d9d-40a4-b0fc-a2904a765406/what_is_concept_of_ethical_relativism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a9fc38b-ba55-4364-a239-17f687164d6e/pawn_of_prophecy_hardcover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab9d5137-9e81-43d8-b155-6715dd5996a0/vipamelesakijiwum.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_off0000ed27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED27 5452 bytes
SHA-256: 5bdd141a14199dcb171658702af29ecece7919372588787b6d6f1eac39224560
font_01_sfnt_off0000ffa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA4 11080 bytes
SHA-256: aba1c7261289f073a8e4a59c80a3833b55b9c7576e9ea027bc6924e02c377a67

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