Malicious PDF — malware analysis report

Static analysis result for SHA-256 4720c5a537c03814…

MALICIOUS

PDF

74.3 KB Created: 2021-05-29 04:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3bdd1a6d3f5a277f5a845f4626e0b240 SHA-1: d9cdc1e6274f75a50beb565dd1880248dc583f16 SHA-256: 4720c5a537c0381493f7f90efe9c5e0b28cdeffd4cf4280b156d5c6d40f85cf6
156 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 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 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://gimoguvi.ru/strik?utm_term=turo+promo+code+march+2021 PDF link annotation
    • https://vutadatibanol.weebly.com/uploads/1/3/4/8/134883393/2388731.pdfIn PDF document text
    • https://pegitizikaze.weebly.com/uploads/1/3/4/7/134730703/138c6987db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475217/normal_600751f98294f.pdfIn PDF document text
    • https://visizejafu.weebly.com/uploads/1/3/6/0/136093068/b595a637fb4fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377407/normal_5fdc1915efe65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407331/normal_6017d06c8c6c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419832/normal_5fd082d74a74d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409239/normal_5ffea394186f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418981/normal_603c8126e7c03.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/60c61884-ea10-4f66-9e40-42b73f439fbc/newoxaketevonefenixiten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a3314d3-5d7a-4a04-8fb4-d832c3429e69/composition_of_functions_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b210bef5-2699-4eb7-a31b-69f1afe6c4f7/zalafewijunedonesemuxuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d84decf-5625-4020-b9e8-efe8b03f9437/what_is_criteria_in_wrestling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a93d7bd-0955-4881-9407-090993cb3b4e/graceful_ghost_rag_violin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c589aa8-a5e5-4de3-93bb-c37d0c592fbd/comentario_biblico_adventista_tomo_4_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0f805a9-0033-40de-812a-97a76f3b4961/21448113037.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49de8393-ba46-4878-994c-01c9e19bcc98/faded_easy_piano_sheet_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13876912-1084-493a-b341-8680fb2e0991/54042662946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c669fcd6-a799-4ea8-b8a3-e02c3b1d65ee/spread_spectrum_systems_with_commercial_applications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11b020c4-65be-4816-9243-6f697938a443/gifakipatovunuj.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_off0000e438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE438 5380 bytes
SHA-256: 85cbce43a993c924eeecf038ec83d35f87a5d59a7e34f4642f35c3c194e22d19
font_01_sfnt_off0000f658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF658 11152 bytes
SHA-256: 5b261b339977b1152d1dec1aa24b43cffa05f345c915fe34dd86b096d2e39b8a

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