Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f610bcd8e96246…

MALICIOUS

PDF

81.7 KB Created: 2021-05-23 15:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7df64da6bcd1f5026ef2328d1fa00108 SHA-1: 46dd652002d2ca0ff551acfba1204cdc46dca19b SHA-256: a7f610bcd8e96246f9315148e0c8130e6a48c2300967c6b667e0881ff6066b35
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one prominent link pointing to 'https://jacksth.ru/strik?utm_term=melhores+momentos+de+flamengo+x+internacional+hoje', suggesting a phishing or redirection attempt. The document body, though heavily obfuscated, contains text related to a sports event, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://jacksth.ru/strik?utm_term=melhores+momentos+de+flamengo+x+internacional+hoje PDF link annotation
    • https://selokifasafu.weebly.com/uploads/1/3/4/3/134383977/a068ad.pdfIn PDF document text
    • https://kavibugu.weebly.com/uploads/1/3/4/9/134902942/kafiwujewek-kiwukufuvo-vupaxuji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477379/normal_5fe5f6334e493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387806/normal_605c6cb1a89fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425926/normal_5fc9f71a977d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506200/normal_5fda93a60707d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379482/normal_600497284abdd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tobito/computer_skills_cv_template.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/81075646636.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/ffxiv_castrum_fluminis_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/how_do_you_measure_gas_pressure_with_a_manometer.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/how_to_clean_washer_inlet_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/fezix.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/que_es_bosquejo_topografico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a461060c-cb26-4a87-bbfa-5bdb6cab8b01/star_wars_revenge_of_the_sith_incredible_cross-sections.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41442c48-8bcf-4a61-8d5f-14ec3469f0ab/how_to_allow_flash_on_chrome_by_default.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/tawunemelexotatakepe.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/veromazakimame.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/80047585355.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/sugodatejabaxotuje.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/dns66_block_ads_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/193aaf44-af46-45c2-8de9-d589545c9fb3/why_is_my_router_globe_red.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78523361-1e3b-4638-bc47-6e8be5ab9f8b/15280987978.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/boom_boom_shiva_song_ringtone.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_off0000fcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBC 5584 bytes
SHA-256: 65ca1619842f4e2b939ecf0f0120d4a303af0139d7c08a369fd77dffaf9947c6
font_01_sfnt_off00010fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA2 13452 bytes
SHA-256: 5e11764671905b4c3ceb01016ebd8e0d511c244fed3ff54c8b0ff1eb5bbffd4c

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