Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9734e3422560b0…

MALICIOUS

PDF

75.6 KB Created: 2021-05-11 22:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bcf41eeeac88cdda781b7ec377a75047 SHA-1: b7b80c72520c12e4712c5360565ebfabed9cb855 SHA-256: 4e9734e3422560b00e1e4e712f4776d966507f39d6083ea4f6635a4a2507abbb
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 0.9998

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=can+i+use+roku+stick+without+remote PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425768/normal_602c7f5da39aa.pdfIn PDF document text
    • http://tujozavido.66ghz.com/mbti_test_results.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401540/normal_5fd6c8b36c1af.pdfIn PDF document text
    • http://kofodotig.sportsontheweb.net/94250867914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466411/normal_60450a4dc1293.pdfIn PDF document text
    • http://buzevuzelape.mywebcommunity.org/candidiasis_cutanea_tratamiento.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/frequency_list_spanish_1000.pdfIn PDF document text
    • http://dowotezovemalo.mygamesonline.org/lotiso.pdfIn PDF document text
    • http://juvovagesubo.mywebcommunity.org/nowapobomev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gototura.myartsonline.com/87238421112.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/vegan_main_course_recipes_dinner_party.pdfIn PDF document text
    • http://guwupurog.epizy.com/how_do_spaceships_overcome_gravity.pdfIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/12428847702.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/22210424592.pdfIn PDF document text
    • http://semowomeso.onlinewebshop.net/vonuluf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c44d1e0e-8325-4f80-9a8f-f4d4e88c1675/dexter_laundry_drain_valve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2423cf1c-4c35-4971-b1c0-3eb6a251f2a7/wepimiwoxovuroxugu.pdfIn PDF document text
    • http://najubizep.epizy.com/98044923901.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BF 5068 bytes
SHA-256: ba42b10b039ffc70fe36a8e5aa51621befab5ecd784b775b0d0bb1565d651596
font_01_sfnt_off0000f4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DA 1796 bytes
SHA-256: 2392d2a4036d2cae249f7277ae14739e0990d25251d4373764733018c1ecb564
font_02_sfnt_off0000fd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD66 10376 bytes
SHA-256: b21cefdb8463a3f088af1cca792d6d08cb5ee062a07c71de9c690386bc9d2633

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