Malicious PDF — malware analysis report

Static analysis result for SHA-256 8887dc844a3a08f5…

MALICIOUS

PDF

76.6 KB Created: 2021-03-25 13:13:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cc1a95149bb37c2e1e8599fdb51950c0 SHA-1: 8d749c40b6033215116c8d7c06f3a862ffa24696 SHA-256: 8887dc844a3a08f5a9151d5ac4d16f1478fddfcde6bf4843aedeea30ec8d24d5
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://resalured.ru/wix?keyword=stupid+monkey+end+of+show PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421329/normal_604cf457c864d.pdfIn PDF document text
    • http://wuzejava.22web.org/new_dmrc_metro_map.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468820/normal_601ae9a91a2f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387928/normal_60325dd485410.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480880/normal_600d4b261b7de.pdfIn PDF document text
    • http://wajulosuju.22web.org/23774981530.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367922/normal_5ff1568590122.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_604f21d769f10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_799c87616fb54e9b8ded9bb48eef13bd.pdf?index=trueIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_a5ae30d9f21c459cb7705c58dc036fe8.pdf?index=trueIn PDF document text
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_f8af16f2e5e04b5d8e20828f4af33637.pdf?index=trueIn PDF document text
    • http://fipemezil.epizy.com/84996436593.pdfIn PDF document text
    • http://keporumutiwem.epizy.com/26369575505.pdfIn PDF document text
    • http://gikikojumikobep.epizy.com/94196511034.pdfIn PDF document text
    • http://najiniroxow.rf.gd/25114387030.pdfIn PDF document text
    • https://7980b0ff-2efe-48f4-a442-6c87bca80713.filesusr.com/ugd/9bd8c3_16904de0c0d643f1a38f5feec1df8ddc.pdf?index=trueIn PDF document text
    • http://bituwevemexeku.rf.gd/nigojusi.pdfIn PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_fea7e2940ab841fb98ba2d508437a730.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_off0000eee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE7 5304 bytes
SHA-256: 985c5054c6ab255a4a35be8553fc8fb0b988d90f406205b08ad786ba64a67e96
font_01_sfnt_off000100f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F6 10712 bytes
SHA-256: 90197226132da3ac767f6a73615ea9e23eb4dc1c221e897c66e5dc516dfaf407

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