Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51df1fc65d465e2…

MALICIOUS

PDF

83.5 KB Created: 2021-03-31 11:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ad487afb936292eeb59d560b2c4df4a4 SHA-1: 11fa1e92d1e6fd010991bcb0085e4c2dc0d6235f SHA-256: e51df1fc65d465e29ba5fa312a7276ba276ed3f471b2338916dfa7466248a34f
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 0.9997

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://dafemum.ru/award?keyword=easy+english+conversation+for+beginners+pdf PDF link annotation
    • https://poroxokinawutaj.weebly.com/uploads/1/3/4/5/134507376/budesari_jafilitapaf_xebuzofon.pdfIn PDF document text
    • https://vutuzanepe.weebly.com/uploads/1/3/1/4/131453188/7a8baf47b.pdfIn PDF document text
    • https://cdn.sqhk.co/vizoxaxijojo/cjche8A/gokaso.pdfIn PDF document text
    • http://creditstar-kabinet.com/39091207816eps0c.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/fBPhhED/nomokolun.pdfIn PDF document text
    • https://xoxomedeze.weebly.com/uploads/1/3/5/3/135308121/bidageri_fipit_fubokozoj_rulowugaga.pdfIn PDF document text
    • http://ndfnasg.xyz/9089578062811g7j.pdfIn PDF document text
    • https://cdn.sqhk.co/dofubetu/cjhB3le/dozewuwirukalalaxeme.pdfIn PDF document text
    • https://balawuwugo.weebly.com/uploads/1/3/4/6/134622143/jikugabitotulon.pdfIn PDF document text
    • https://nobakavukip.weebly.com/uploads/1/3/4/3/134373074/vutatanobitefa-mevizufuvuvuve-fujabagexuses-xukedusupez.pdfIn PDF document text
    • https://xinelonaveguv.weebly.com/uploads/1/3/4/6/134606197/26ea2.pdfIn PDF document text
    • https://dojobojijiwum.weebly.com/uploads/1/3/2/6/132681334/vavaroza.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/b640c4fa-d05d-44f5-a959-457a9e6ba38b/boguzokobunokebujoxene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46134dfc-c355-411c-98d0-c7a351ab2e3a/wixipa.pdfIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_cd1f169d159e47e5a04b60cc872167c4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb44fef0-947f-431d-a0e0-d94daeac31a0/2001_yamaha_kodiak_400_4x4_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7069489c-eccb-4f51-a461-2050b5640b6b/weber_spirit_2_3_burner_natural_gas_grill.pdfIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_cd5ccc2cd0c4445aa453adaa3c229349.pdf?index=trueIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_32aa957c405b4fdc9c32d5d7b19d0d88.pdf?index=trueIn PDF document text
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_10b700a44c5743c4b565b68e299ff7b3.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 5676 bytes
SHA-256: d2d0faf6e456c22ae2bb6dcbfade47d2a210b643ee7c2fa4c10e19294a5bcdca
font_01_sfnt_off00011a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A40 11148 bytes
SHA-256: f9b776d88ed2038b21583fa46b602f243c893239abdf87c9136f459250447f01