Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d970c0b7be20ae…

MALICIOUS

PDF

78.6 KB Created: 2021-04-10 00:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 78503c60c9e0e36d93704172bbe4c771 SHA-1: cd3fd2147133ad302c0a0d5c6afbdd18d38da5ac SHA-256: 46d970c0b7be20aefa8354e9ce5f7226437556a739e0fea52f444540c4fd81fa
186 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 are disposable and hosted on services like S3 and Strikingly, indicating a link farm or SEO manipulation tactic. The primary malicious URL identified is https://botokaw.ru/strik, which is likely used to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://botokaw.ru/strik?utm_term=why+does+the+sky+is+color+blue PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/latest_android_phones_2019_india.pdfIn PDF document text
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_77b3f2cdc8614f74bace29c50d3d6082.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xidazeze/what_do_you_need_to_get_a_state_id_in_hawaii.pdfIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_f86ddfaa21cc4626bcb371e897024241.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/67deb1c5-f8c3-4081-a0b7-3145ede46f5d/dometic_rooftop_ac_not_cooling.pdfIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_f31ca284d03f462995c89f8942aa543c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/195101a6-fa30-4713-92aa-de5e91798a2d/sap_fico_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3323c158-9bd8-406d-b94c-5ae6781349be/gunsmithing_books_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/6163834209.pdfIn PDF document text
    • https://f5d5bca3-0ffd-41e3-a77d-3d805a1e43e5.filesusr.com/ugd/4e23ca_311440f5e51a463a8a62d236e00312ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sevoga/raxejevesarukowat.pdfIn PDF document text
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_d5853e06bd554d5c9eb560c807d5ada9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/13fa9fd8-ed37-48ab-b5f1-8c5c298be87d/pharmacology_and_the_nursing_process_9th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/60985489483.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9485bd48-0b15-4330-8a16-b9fa6b20c677/3170803338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf29164b-b4d4-4b2a-94e3-696b99fc69d8/zaxemidonafu.pdfIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_598653900762475cb99a4e2918ebb6af.pdf?index=trueIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_5f8def56f4194c7da372a210568fccc2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb908f99-065b-48e4-a9a6-6a7267cf3926/magnum_energy_inverter_charger_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/whos_the_ugliest_in_bts.pdfIn PDF document text
    • https://c534e673-b245-4a6d-8787-855fe96db707.filesusr.com/ugd/e19215_4339468d174b4343a566a2bbf9c5ec84.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/acoustica_mixcraft_for_mac_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_off0000f679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 5136 bytes
SHA-256: 7842b52a448edbbd3fd8d6cc07f02c74c98060b264cfc44fa0903cf17bd5281f
font_01_sfnt_off00010800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10800 10780 bytes
SHA-256: 9108cf606ba6999a763b4f28b833280d839be9aeb50a44c6ccde6515d2e6ffc6

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