Malicious PDF — malware analysis report

Static analysis result for SHA-256 85624cc063b3f366…

MALICIOUS

PDF

72.4 KB Created: 2021-03-11 22:00:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: da0b540e03b316e304da2145db27037b SHA-1: 93292077b654de70c27e068f5091029069fda3ef SHA-256: 85624cc063b3f3663f2e684548b3ecf20229f4174a18a5b6e9f993ef9c2759f7
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 0.9997

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://maypoin.ru/123?utm_term=celempung+instrument+information PDF link annotation
    • http://tejaberi.iblogger.org/kurebezogenifo.pdfIn PDF document text
    • http://xelasurugopu.mywebcommunity.org/45911762166.pdfIn PDF document text
    • http://nopuvobetag.mygamesonline.org/18752402326.pdfIn PDF document text
    • http://vumexovuvelafe.medianewsonline.com/does_roku_stick_work_internationally.pdfIn PDF document text
    • http://buwubaled.mywebcommunity.org/24911601667.pdfIn PDF document text
    • http://fafesixokegigi.getenjoyment.net/tintern_abbey_summary_in_english.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/rajewuwomukake.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/55341500692.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/459b29ec-d7b5-4035-99ff-fc03056911a5/is_the_old_testament_written_in_chronological_order.pdfIn PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_60fa5013995a4ac9a6bd86d4fc9e3186.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/432059c5-ebce-4ca6-9a1f-d0467f5a08fb/sofiwifaserewexevoma.pdfIn PDF document text
    • http://sopavame.onlinewebshop.net/vitidutob.pdfIn PDF document text
    • http://tuxefefili.epizy.com/abcdefghijklmnopqrstuvwxyz_i_love_you_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b239d600-be6c-4c2e-b38b-0a3b82a3dd42/dell_r710_bios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/987fa686-ad49-44ac-986c-cd2415b8f7d3/dragons_4_release_date.pdfIn PDF document text
    • http://lawesiwewif.onlinewebshop.net/30932332427.pdfIn PDF document text
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_b9d740a009d346f58548cd2d8e4e6de8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c02d5a8-05c9-47d0-9010-50d2b91464c2/ladofonatitofo.pdfIn PDF document text
    • http://mibanuxebom.rf.gd/24414598668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee16c9b5-0e2e-45aa-9a09-cea4df8285d0/whats_the_cheapest_way_to_build_a_tiny_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35b946ce-ed32-41a9-a59e-27eb0c1e95f8/refotalopajuzima.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_off0000df5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5A 5124 bytes
SHA-256: b18598c23ceffbd3e534c78fec543d3698e17a56d79ae01ca38f835b7e7e1a08
font_01_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 10696 bytes
SHA-256: 459e281dc1a07e9b8aca95e6a18bc27e816016ea964e49af3c08212331ea4183

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