Malicious PDF — malware analysis report

Static analysis result for SHA-256 8858d9aaa8deebb2…

MALICIOUS

PDF

64.2 KB Created: 2021-04-21 17:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: bae51cde91b962407b89b063bf475931 SHA-1: 82648d021d32e529113867065f6ad8cbf4a93de8 SHA-256: 8858d9aaa8deebb2880ec8892d694a05af20c75e4fbeb24bd4370d505cff54a6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to unknown or potentially malicious domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://crophysi.ru/strik?utm_term=doorking+1812+manual PDF link annotation
    • http://fakaripeti.xyz/114035452844wes7.pdfIn PDF document text
    • http://pollsexpert.com/gisizifizel1iwl.pdfIn PDF document text
    • https://mofasabopileb.weebly.com/uploads/1/3/4/1/134109330/36cd8c1ea8.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/gakiwedabudunawa.pdfIn PDF document text
    • http://mudikovarew.mygamesonline.org/ocarina_of_time_great_fairy_fountain_music.pdfIn PDF document text
    • https://jowanubeso.weebly.com/uploads/1/3/5/3/135399775/9d52a0883.pdfIn PDF document text
    • http://regsenatvumen.website/tusevabol96vh0.pdfIn PDF document text
    • http://onkoprofi.ru/84551231533ztxq.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/d54afb7f-4158-4a5c-b91f-8beb135acde3/69240251350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a477196-f13a-4dbb-9155-3ee4d7e068f4/zeloreze.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/lancing_device_accu_chek_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/multiplication_and_division_of_decimals_worksheet.pdfIn PDF document text
    • http://padegijogul.atwebpages.com/zenovirozemasipod.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/22167424323.pdfIn PDF document text
    • http://xemunebo.atwebpages.com/makkar_ielts_academic_reading_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/86795258407.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/28117292018.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/tenigigepemelani.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/cakewalk_pro_audio_9_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/real_estate_agent_employment_contract_template.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_off0000c29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29C 5268 bytes
SHA-256: 0f205264efcaa811fb90306c5a7e848aa033fa7b862d43ba64e7f246f08ac0fe
font_01_sfnt_off0000d47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47B 9196 bytes
SHA-256: b2567b215871f4275f71daff086623fd452f0a598167dd40d078e87c77dc2aa3

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