Malicious PDF — malware analysis report

Static analysis result for SHA-256 5964ada6abdc115e…

MALICIOUS

PDF

78.3 KB Created: 2021-05-17 07:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0975a6f9b858ca88261d62665bfd031d SHA-1: d46c011ab45fe0025fe066d48821048f02496438 SHA-256: 5964ada6abdc115e715f5a61aa4ab0e6c4b2c291bbaa6b23a3389fe069ccae69
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain 'crophysi.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is structured as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/strik?utm_term=what+is+essential+to+every+living+thing PDF link annotation
    • https://betepojikimiji.weebly.com/uploads/1/3/0/8/130874485/a1ec7fdea40b2a.pdfIn PDF document text
    • http://gonifarej.mywebcommunity.org/30744637284.pdfIn PDF document text
    • http://lowabunuzoxa.getenjoyment.net/betikebumebaxukuveras.pdfIn PDF document text
    • https://miluxeto.weebly.com/uploads/1/3/5/3/135326788/mogiwodotifevu_foxiwiwurebekib_rofadifonejupid_xijatesagunadiw.pdfIn PDF document text
    • https://wisapemewe.weebly.com/uploads/1/3/4/7/134713478/zalesonagex.pdfIn PDF document text
    • http://sakosoverunupa.iblogger.org/marisepuzewuledaj.pdfIn PDF document text
    • https://rusopanuguxixat.weebly.com/uploads/1/3/4/6/134640346/7771919.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/solikalabawixodoz.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/185925ab-7657-4b42-bff0-0e362e63c96f/zojebigoxitig.pdfIn PDF document text
    • http://dufojamimusim.atwebpages.com/ahuja_pa_amplifier_circuit_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/51952393256.pdfIn PDF document text
    • http://fesejawezu.rf.gd/ikea_queen_bed_base_with_storage.pdfIn PDF document text
    • http://wekujugom.epizy.com/six_sigma_black_belt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab8b781b-87ef-42d4-86a6-76d0ec34a705/how_do_salt_and_sugar_affect_yeast_activity_in_a_dough.pdfIn PDF document text
    • http://lirebeto.rf.gd/relitij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98dba62f-c330-4065-a818-7b89861f5eea/91592469818.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/why_were_the_spanish_armada_defeated.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/27300951074.pdfIn PDF document text
    • http://susabumo.atwebpages.com/employment_news_17_august_2020.pdfIn PDF document text
    • http://wewapozolebupo.epizy.com/bible_verse_wallpaper_for_mobile_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9c96d45-7704-4255-a00e-be23aab56adf/9288426523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8297d99-c28d-4223-aeaa-f8bd074aeff8/72618547526.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_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 5124 bytes
SHA-256: 0bcfe62e5719ac4677d0deb5ade5bd1e254117db8003a0af8a9513572f357c07
font_01_sfnt_off0001059b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059B 11200 bytes
SHA-256: 1c2d187cab6aebecba25d124bf344111eb1aa38b34d73340d4277ea31f63f787

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