Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd77880009ee86e…

MALICIOUS

PDF

76.2 KB Created: 2021-04-03 02:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7667215c00d50cd4c6b0fe49ecf8eab2 SHA-1: 71ec4c8e7955b0a2c2b03a4370617884b46ad466 SHA-256: 2dd77880009ee86e5ca579cb1c74ed1930342438ea9b5b31ef41d74716e0b0c5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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/award?keyword=pdf+to+word+ocr+conversion+online PDF link annotation
    • https://gotenalonas.weebly.com/uploads/1/3/4/3/134372716/durotemowodiwiro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465908/normal_5ff3f5224e3ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472186/normal_60247f45b5d5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486354/normal_5fe13f6d6ca2e.pdfIn PDF document text
    • https://lijuvimu.weebly.com/uploads/1/3/0/7/130775306/6035298.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481397/normal_5fcc506c7c968.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426558/normal_5ffc6479bca32.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_087423f03c384a8e85f151ee0aa337a7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/532381ee-d34d-4283-a5b3-a40a600b3321/28222201980.pdfIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_d6c4dcbf29df408fb3c725e5fed7c4bb.pdf?index=trueIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_f68c9c11bc934d60b3ca5b31d7b4c9e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/what_does_social_researchers_mean.pdfIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_37a32b3964e942c28571a6f2701fff1e.pdf?index=trueIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_9ae88570c0a04d9bb825154333ca6fb5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bubeto/baldwin_overture_fun_machine_organ.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff81ac29-352f-4a7e-960b-ba2d59fddd2a/jukudumixotabutote.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/17897237176.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/the_communication_age_connecting_and_engaging_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50ed56b6-018e-4615-8465-705ed821bfd5/how_to_learn_to_read_egyptian_hieroglyphs.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/kafololuwariwitosetozefe.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_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 4960 bytes
SHA-256: a23101103ebd403ab320da8ff7e806ceb10e1315c29f40fafcda0e390948580f
font_01_sfnt_off0000ff49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF49 10492 bytes
SHA-256: 44af1eefe74d764663aff02b7b32c1c60229a119970559699c5229fa68d2643f

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