Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad042f1f175d45b…

MALICIOUS

PDF

74.4 KB Created: 2021-05-21 18:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a919790c170da6001efdd111bb0a69b2 SHA-1: 21eef8d3c0a93f23db1781f018cba390d92f92e9 SHA-256: 8ad042f1f175d45bbd9e4f2fb998cd29550fcb8d0ac772d0c0a3c48cd18a58d6
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains numerous links to external websites, many of which are likely part of a link farm or redirect to malicious infrastructure. The primary malicious URL identified is https://yafferge.ru/strik. The document's content, though heavily obfuscated, appears to be a lure related to antique stove prices, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=o%2527keefe+and+merritt+antique+stove+price In PDF document text
    • https://feketofemij.weebly.com/uploads/1/3/1/4/131452988/gimojo.pdfIn PDF document text
    • https://sositero.weebly.com/uploads/1/3/4/3/134389363/605486.pdfIn PDF document text
    • https://dejigusadimegog.weebly.com/uploads/1/3/4/3/134324817/vudupodelusafuwapazo.pdfIn PDF document text
    • https://rofokaragi.weebly.com/uploads/1/3/2/8/132815015/ponekomapusenilatune.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/78523361-1e3b-4638-bc47-6e8be5ab9f8b/15280987978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da783d0b-5528-49d5-9359-1a9436c6f9a7/dabefoxurarogazudara.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42037ee2-ea35-41b4-ae76-4684044d6faf/fomebezevew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/626ecdfd-f01f-4eaa-a5ae-04a06dd959b8/5931972475.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/nuxomuwiduxadekotawo.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/rudin_functional_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxegu/nojewezavoxir.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/360_antivirus_software_free_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/wifomipuvufoludezezejepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6811d04d-2446-48ee-8311-0d767e6d4c97/fejipaxox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8bddf99-2953-42c9-9633-9661b0b59b99/mutumom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14e7528e-b870-454f-9c8a-7f4ef7abfb2c/learn_python_3_free_reddit.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_off0000e186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE186 5580 bytes
SHA-256: 2f0206a8add149ad2e894a6e002f82c7f61a0da714fab651790ce36f104195b7
font_01_sfnt_off0000f47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 11816 bytes
SHA-256: 1d9a0679e920bca2540935d63c7a42134bed7a2c214c27ac9092990aaaaa49d3

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