Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b803cf0443dd48…

MALICIOUS

PDF

78.2 KB Created: 2021-05-22 07:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 089c9fec71c2fe3585bb5f885a54775e SHA-1: d7526f0e7cb308cd0bf725b615590158a24feef5 SHA-256: 08b803cf0443dd484fd61bd7aa9bc2831b3fc2f4d20fdcf6bcbd1d843c10a2b0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as a phishing trojan. The embedded URL and the link farm heuristic suggest the primary goal is to redirect users to malicious sites, likely for phishing or to download further payloads.

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 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://soxebez.ru/strik?utm_term=gmail+google+search PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4405925/normal_5fee290ad3ce6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393179/normal_60648f714d50a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387419/normal_5fd8804975922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475729/normal_6033bb5f7be57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486200/normal_5ff163b3b05b4.pdfIn PDF document text
    • https://dukiferuxol.weebly.com/uploads/1/3/0/8/130873869/5fef9018b773.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425926/normal_5fc9f71a977d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391896/normal_5fdfd11bd374d.pdfIn PDF document text
    • https://wuzakadebetes.weebly.com/uploads/1/3/0/8/130814976/1243417.pdfIn PDF document text
    • https://nipibodofabujid.weebly.com/uploads/1/3/4/2/134265940/jadazivetiruwumanus.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/1291fe30-4179-4969-81a8-b7caeae6dfa6/devops_handbook_audiobook_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e05269e-1b86-41fa-9a90-69cc54d2d3de/lixada_192_channels_dmx512_controller_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2524b9ed-3030-4e4b-8906-9541de947255/41965921163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2f23ae5-b4cd-4309-959b-7e1f6c9a6a1a/96226965958.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/glaucoma_treatment_guidelines_us.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/simplex_4100_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc80b131-0be5-43f3-b8e6-06ded82c6f84/buzojobenukategetoliv.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/case_files_internal_medicine_6th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a2c46b0-6fcb-4717-a0ab-59c7bf9eb372/77012441615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d16199a8-582e-4826-a21d-933851137bfa/sirinen.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_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 5244 bytes
SHA-256: 726494b88456d5b027bfece195cebd3c8ff82d4f8a2e2abd8e1a7cde6c51f705
font_01_sfnt_off00010573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10573 10864 bytes
SHA-256: d0b393ce26a44418a42b62124fd1e7eaee3c8739123c43fdb14c856c8bbdee2e

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