Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac81bc5609b5dfc…

MALICIOUS

PDF

78.4 KB Created: 2021-04-04 11:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a3dedeb38d80d549bf509ee13f14bc14 SHA-1: dede89ef8633628af3900734a8c062652cabf406 SHA-256: 2ac81bc5609b5dfce513852cc87b89f29d5d39b429917d0a13fb7d37ca1f2033
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=how+to+adjust+g+shock+g-7900 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471682/normal_604b93f1b218c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499285/normal_603a471a3b3da.pdfIn PDF document text
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/vagilefapezimevisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381344/normal_601b2a0d3259b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424630/normal_603a62f912bb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383302/normal_605f5a6a470f1.pdfIn PDF document text
    • https://gowapatemik.weebly.com/uploads/1/3/5/3/135319450/xetoxamupe.pdfIn PDF document text
    • http://pebonemariv.mypressonline.com/64601956938.pdfIn PDF document text
    • https://bevereka.weebly.com/uploads/1/3/0/7/130739533/mivodenof_seguwuxov_zuper.pdfIn PDF document text
    • https://kekisadubivef.weebly.com/uploads/1/3/3/9/133986731/c04df44a49038b.pdfIn PDF document text
    • http://saniwigudovo.scienceontheweb.net/5726734851.pdfIn PDF document text
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/getegomeb-xazoxitu-vajobamek.pdfIn PDF document text
    • http://munasimowijuxi.getenjoyment.net/gita_sadhak_sanjivani_english.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/26fa3d22-5e85-48f3-a3c2-9ca55e7263fa/bivuli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc2d9c6-7899-41bb-a194-43220dcb3ea5/best_small_dvd_player_for_tv.pdfIn PDF document text
    • http://nufulavidibime.myartsonline.com/couples_therapy_techniques.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b73938ed-e81a-4edc-919e-a70323f0abe6/70943910064.pdfIn PDF document text
    • http://xifeloj.onlinewebshop.net/business_progress_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10bbb984-c16c-4484-a70c-90f7c5c32c8c/how_do_i_know_if_i_have_a_gy6_motor.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_off0000e7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F6 5676 bytes
SHA-256: 2e53fec94f4df0cb1c7eb012c78c271a91b605825204e3f5a5845f60febef885
font_01_sfnt_off0000fb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB69 15260 bytes
SHA-256: cb6a17d621b79153026e35ad1a5480d82c19d619041d7074543a7beb2c916259

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