Malicious PDF — malware analysis report

Static analysis result for SHA-256 67305e827ce4c8c1…

MALICIOUS

PDF

73.1 KB Created: 2021-06-12 00:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f8088113ec80ea6d99baa7f633257888 SHA-1: 337051fc08ee32efe1adbeb9c7644daf56136d68 SHA-256: 67305e827ce4c8c1a89b4d14536f5f0d95c7b3692da3a4be4d9b35aa1aed59a4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary external URL, 'https://cructi.ru/pbw?utm_term=i+like+it+cardi+b+mp3', suggests a lure related to popular media, likely to trick users into clicking. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the PDF structure and the presence of external links strongly indicate a phishing or malware distribution attempt.

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://cructi.ru/pbw?utm_term=i+like+it+cardi+b+mp3 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367922/normal_5fe8b276762a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407983/normal_5fd97be1a68aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416332/normal_5ffe52421facc.pdfIn PDF document text
    • https://rokerisokexojud.weebly.com/uploads/1/3/0/7/130738924/2bcad468.pdfIn PDF document text
    • https://sarejazaxixosib.weebly.com/uploads/1/3/4/6/134633098/nopejijazap_mugore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480905/normal_5fd681391dc55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420029/normal_603e6c3c1c240.pdfIn PDF document text
    • https://petapizegu.weebly.com/uploads/1/3/4/3/134327096/8229064.pdfIn PDF document text
    • https://baxorejo.weebly.com/uploads/1/3/5/2/135295822/6118080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382407/normal_604d8f325f0cd.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/fc2e29ca-896f-4456-a44b-5135753b58cb/zokamatuwuwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/450ce929-15c4-4e44-8890-bee587900514/jufiginenepunon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fecf3dff-3451-4833-9b92-23c14540a95a/11492102794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ecce186-b13b-4c5e-888f-ff05e9a666fa/30232909768.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31d9f987-544c-4aa0-9bfb-62a62bff4c57/balanced_scorecard_powerpoint_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb9e9a7a-c732-4017-9748-8340199ca7b7/nobafemubabukiwixobepimeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee66e8a0-830d-4d04-b7cb-97bae2c951b1/37771666773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1124b1c7-c863-4b14-8a8c-e1ee238a74ad/fender_mustang_amp_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a2a26b6-0506-466e-9bf3-d8acd300df88/what_is_an_example_of_avoidance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4dea825-da66-4259-8c52-18102c566254/kinds_of_sentences_worksheet_for_class_4.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_off0000db7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7C 5348 bytes
SHA-256: 799dac86a9da58737ba8e483d36d5d1e9b033a37984e025854d779b6a315ba29
font_01_sfnt_off0000ed93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 12052 bytes
SHA-256: c8b94d9831f76547222b62a924d3d8e555f5c253fd76e858efd03bc43cc459e7

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