Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eacc8b9d053a8fc…

MALICIOUS

PDF

80.1 KB Created: 2021-04-16 02:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a36ea8cfbb56cce5f0b06f7567d35bd9 SHA-1: 551388b0a5be69cf6a70ef0aaba224a1b4b5599c SHA-256: 8eacc8b9d053a8fc80bf78efc5d3531bcc8d7dfdadbffdcb6f22dca3749e7c9e
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://dafemum.ru/strik?utm_term=protocol+helicopter+remote+control PDF link annotation
    • http://forecast.bet/9476236862w2zh3.pdfIn PDF document text
    • https://rixogeki.weebly.com/uploads/1/3/4/6/134693266/75e43e94d3a4f.pdfIn PDF document text
    • http://ledimpress.biz/6_ps_of_marketing_by_philip_kotler46o4f.pdfIn PDF document text
    • https://worojipe.weebly.com/uploads/1/3/1/3/131382243/zijukidafer.pdfIn PDF document text
    • http://noguwizipipolom.iblogger.org/fanafajaretoresajesize.pdfIn PDF document text
    • http://gopubewigofopa.iblogger.org/gozemasunevojisor.pdfIn PDF document text
    • https://tesebajaja.weebly.com/uploads/1/3/4/4/134402558/33a0964876a1.pdfIn PDF document text
    • https://jadegivi.weebly.com/uploads/1/3/4/8/134851053/9b6853190d5b05.pdfIn PDF document text
    • http://jsexj.fun/safety_first_car_seat_setupnluf0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_3de39700ebed422eb7a4aca0ffc279bb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0f0a482-92d0-48b9-9e8b-bac8f715a8ca/94197557014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba5f9061-8b2c-49bb-9fc1-4780c6695e33/nurorij.pdfIn PDF document text
    • http://losajumener.rf.gd/42334711373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc95fc91-71b1-4a21-8f9e-d749fec22c54/18405715311.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b61405e7-57c6-48a8-a8bb-5260cb5ceda9/zimojasimisadimoxofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec19348d-719e-41d8-b3c7-b395abb09e7b/fojavofa.pdfIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_4ad92849c52745798b37a23da1f4b81c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3b9315e-375c-4c06-9910-ef7ba2b192ae/jixakedifotutebexoxomulo.pdfIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_0ec8e80b7fa94e609af778dc595d523e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fdcb8b1-5e2b-4e2e-a972-6fb1c62424b8/what_does_the_merv_rating_on_filters_mean.pdfIn PDF document text
    • http://gizimup.epizy.com/linear_algebra_textbook_free.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_off0000fb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3B 4788 bytes
SHA-256: 487289ce0034f197dc9f2d32e127c74e4557d6174d40cc34d3eeeb855fe187a0
font_01_sfnt_off00010b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B58 11292 bytes
SHA-256: 98d94db33ebd607003a1cfc05de02729e388b676d22803de7a0e51801a2fff8f

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