Malicious PDF — malware analysis report

Static analysis result for SHA-256 f464d18b0e7c0c51…

MALICIOUS

PDF

75.2 KB Created: 2021-05-31 15:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 3ec402a22a9a401d0f93d60afa398c9b SHA-1: 2f5bb7106668873878f0d49ae810ba54e45b04fd SHA-256: f464d18b0e7c0c5163f79e127f6dccde4f2c7c7c2643d44415d643fbf3656cd1
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or potentially malicious sites, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The document body, though heavily obfuscated, appears to be a lure related to job postings. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=pst+jst+jobs+in+sindh+2021+uc+wise+list In PDF document text
    • https://gatojodegapov.weebly.com/uploads/1/3/1/6/131637656/80527023f21c43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460457/normal_5ff8380385761.pdfIn PDF document text
    • https://pojamemurix.weebly.com/uploads/1/3/1/4/131408024/1314542.pdfIn PDF document text
    • https://xiduxerajul.weebly.com/uploads/1/3/4/6/134696605/modamojekakasi_felusika_visubev.pdfIn PDF document text
    • https://votuwokikinoso.weebly.com/uploads/1/3/4/4/134466575/a093d65e6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469847/normal_5feda6dba7c3c.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/134b5d97-cf2c-44d8-a2cb-40694f847d0e/97969363579.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcc78d57-ed67-4a51-ac1c-dab911f116d9/amsco_ap_human_geography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d109e93-ce8c-4773-b455-1532f404ef9f/intermittent_fasting_and_its_benefits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7aab4c5-557e-45b9-8469-03af98cc82ca/64166776285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed9b7aca-b799-462c-b5cf-032c1b76c617/30513120167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/119d8eaa-93ee-40d5-81fc-f29b5a6ec32b/vizio_36_inch_sound_bar_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/561b9031-782f-4bf7-8fa6-5b3f1529c810/twilight_full_movie_in_hindi_part_1_download_1080p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c55fd412-bd3e-4853-85ba-71cc8c4498a1/lobigevelotirepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb685cca-b87c-4565-b496-ffa8889e347d/bexezagawam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/048863cf-6d57-4049-96fa-ecb86188dea7/los_seores_del_narco_filetype.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb7ea1cd-a77d-4f1d-bbe0-28d4a7f47442/lixixonesupuguzuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40aaaeeb-6913-4871-b179-e0796e2823b1/jiwetenezekatanatute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53a3ffc9-807c-4095-9beb-7134474c3445/lasufetixanirix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fb74748-84c5-4340-a657-9db335b84edf/27937987410.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2747e61-440e-494f-8f82-0800857943ca/guzakulibikatad.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_off0000e6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EF 5356 bytes
SHA-256: 672fa5af3a32ddc9077f09154892b58acf82d2870471010ee877337a19da8524
font_01_sfnt_off0000f943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 11304 bytes
SHA-256: 68c2183aaf70bed97f764351259bd59ddde6f0857d5f6cee49ab1d35018ee447