Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdf5fc667b1327f…

MALICIOUS

PDF

65.4 KB Created: 2021-03-16 11:38:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad1637ebdfdea579360a1e66e21fd3eb SHA-1: 2c16a5ecde4e75682cfd012acd2b6612fd4ac3ad SHA-256: efdf5fc667b1327fa6b50b795dfb195e8c7eea6d46b5009f53b21ba28d15701f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are dynamically generated or use SEO-like patterns, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/wix?keyword=electron+effective+mass+in+sio2
    • https://zaridonuxubotu.weebly.com/uploads/1/3/0/7/130775126/kidabeduwolaruf-diterogebep.pdf
    • http://kaboperesepasu.iblogger.org/42013544449.pdf
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/karibesirunodel-zepixej-teleroxemu-mulota.pdf
    • https://xixefofitajeres.weebly.com/uploads/1/3/3/9/133999179/xovobeku_zexef_sufewuk.pdf
    • https://vobanugan.weebly.com/uploads/1/3/5/3/135340106/03683eb4a552cae.pdf
    • https://tizevilujiv.weebly.com/uploads/1/3/1/4/131406709/4aa6ab1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_67d7ed4497fd4c56bf471a16514d157f.pdf?index=true
    • http://tuwofexuguxu.epizy.com/18529082922.pdf
    • http://pomigipasa.epizy.com/dekra_gebrauchtwagenreport_2018.pdf
    • http://dazenuf.rf.gd/41167450074.pdf
    • https://uploads.strikinglycdn.com/files/b7af9060-654e-4eaf-a8de-cf402dd2d0a7/what_does_lusus_naturae_mean.pdf
    • https://uploads.strikinglycdn.com/files/3f5c8b51-1c94-4940-be64-5cdcc5f2a801/prince_lionheart_compact_wipes_warmer_instructions.pdf
    • http://wowadepadon.rf.gd/loxowofumudevumotidovexi.pdf
    • https://uploads.strikinglycdn.com/files/1eacc1c2-3c79-49ee-9056-20cb789431e0/obra_literaria_el_si_de_las_nias_resumen.pdf
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_37c90ca18b2246b990057a30777c6420.pdf?index=true
    • https://uploads.strikinglycdn.com/files/29531e6c-cc44-4e99-a123-9e1976b49d76/fesemi.pdf
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_6d1cb923107d4a879cb47fe35ecc21a0.pdf?index=true
    • http://kalilom.epizy.com/c_collections_interview_questions_and_answers.pdf
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_7586ac41491c472081bab92398146381.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c07f39e1-85af-4ef8-b4f6-31d6bc009e9a/what_are_the_best_pellets_to_use_in_a_pellet_stove.pdf
    • http://roxonotagake.rf.gd/donawowupokirijapu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4f6.bin
a2cbb90dce5c93a775bfe67c2ef86d1eb85b2bc406628326820511cb69da2380		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F6 5176 bytes
font_01_sfnt_off0000d686.bin
344e2df8115ad10d5e02110803b1269e5461e5eb78b1ab02d22895bd07938abf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD686 9428 bytes

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