Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e720e4df4eee768…

MALICIOUS

PDF

74.0 KB Created: 2021-03-11 02:09:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7b591940fd41f010e76842b9812dc1f4 SHA-1: 94ee22035bf95e7a1703967f772a6f94cfde5671 SHA-256: 7e720e4df4eee768823b7c98a8c31cbca38a580b7087e293f2d440dcb3b7224d
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 0.9999

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://baarspo.ru/wix?keyword=skyrim+special+edition+leather+strips+id PDF link annotation
    • https://maritomumotoko.weebly.com/uploads/1/3/4/5/134512683/93d9ad59d44d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490920/normal_5fd2e3cf00ad1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403946/normal_5fcfa7e8c1583.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370092/normal_5ff5e69395dbe.pdfIn PDF document text
    • https://disumudumoronu.weebly.com/uploads/1/3/1/4/131408153/sexezugu_dejagagosa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444366/normal_5fcb741c3ed94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443619/normal_5fd063b248554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457563/normal_60349c282a358.pdfIn PDF document text
    • https://zajosozuxisofe.weebly.com/uploads/1/3/1/4/131407459/4017194.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/6d98d6c8-f957-41e5-b196-142b73b340a2/how_much_does_a_er_doctor_make_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26078f60-5516-4c02-8777-27b560359815/karcher_pressure_washer_service_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b250045-1a23-4da2-bf09-59a43f449d3b/lisobiwukonejukulolexafuj.pdfIn PDF document text
    • http://dipapomumekafog.epizy.com/what_are_the_topics_in_modern_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e55c04e1-a0b2-482f-bc4d-31810aa081fb/derasedotisorizakerinok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2be50fc0-7a7f-486d-87f3-ac9bf4aa1327/xuverazomuza.pdfIn PDF document text
    • http://zunuwovadete.epizy.com/sidazunubow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0b0a8c5-bdbc-485f-9922-9b41ac708e8f/94449938939.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_off0000e4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D6 5580 bytes
SHA-256: ba8b673991f10334b639644c3ef69bbccec439e3a8a90ca8f8aba2bf7fb9b81d
font_01_sfnt_off0000f7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 10264 bytes
SHA-256: 2c08610c08a1df41ba3ddfcb9356150322435f9007c4e6784c25b55c68ae6765

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