Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8b8e34833b57a5…

MALICIOUS

PDF

83.9 KB Created: 2021-03-20 18:16:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f2d3b0c482e1820a0ce1fcefdb984743 SHA-1: 3014700b89639edcc6741033bd97655cb2a403a9 SHA-256: 3f8b8e34833b57a5dbd00aa312d0c0fa2d986c055c2d0f1959bda6bf12c9d343
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 0.9990

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://botokaw.ru/award?keyword=enlace+quimico+metalico+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483072/normal_6017513c98b72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415930/normal_5fc737f8be03a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408719/normal_602bfc5b0d43a.pdfIn PDF document text
    • https://cdn.sqhk.co/bimazizuxu/efgehgl/logopekolumagux.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/ifhdjfh/dynamons_world_game_24h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376599/normal_5ff958a7a5987.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/NIichdL/mtg_conspiracy_most_expensive_cards.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382779/normal_5fd08b2930654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449783/normal_5fd675b5bb1af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444882/normal_603b591f676a4.pdfIn PDF document text
    • https://cdn.sqhk.co/vofepubot/jajbY2O/baxorifuganivu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4484a0c1-f134-4051-a7cf-cbf778b1777d/object_oriented_programming_languages.pdfIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_d837d40b67c841cfbd80e2314c860dbc.pdf?index=trueIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_bec24e3d3c624c92b69bb6bc4c3a3cfe.pdf?index=trueIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_3f8029f28aac4f89bfa335398fb8c73c.pdf?index=trueIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_500acbe884ed4ee4a7e2cc39dd228033.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aefccd37-0737-4f05-b181-e046638f8ee8/mifibizuduworajefaze.pdfIn PDF document text
    • https://f2203da8-4034-475c-a980-a37079f2cd7f.filesusr.com/ugd/d29026_20025273847745db99ca62827624cfa2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9134d0ef-94d8-44fd-80f8-3a538828d925/table_decoration_ideas_for_winter.pdfIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_04969f88dd5d41ebbfa8e5014698cadf.pdf?index=trueIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_06955e576da9499288334fb7e7e9ae42.pdf?index=trueIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_af1e595a790f46999f8ca1d18be0ac63.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/64a5e1c2-ecf7-41a5-a531-44eebc6a2ae5/solasokiguxopoworab.pdfIn PDF document text
    • https://f621ecf8-e26c-4db3-9bdf-176eeceb312d.filesusr.com/ugd/b3755e_acc728b442e6408b8b18507424f2797b.pdf?index=trueIn 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_off0000fb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 4992 bytes
SHA-256: 9db3f31cd72d040a64f5ebd5199e1cfc4300d99ee1c6effcda7b291ee9da4df4
font_01_sfnt_off00010c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3F 12204 bytes
SHA-256: b47b625c2205804ed94a195dc8184c2f5a6112c8bba0ffd8b26074143bdf257a
font_02_sfnt_off000133e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e