Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1bd5fc605135dc0…

MALICIOUS

PDF

77.8 KB Created: 2021-03-02 23:43:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b5fc6775e987f522c997585f62ce150e SHA-1: db7b4872865ee61041549fd264fdd4a73bd7a360 SHA-256: a1bd5fc605135dc0c6a423e2ee82b1ef2be5516850095e65f8f50afb460dfa52
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which point to SEO-optimized PDF documents, suggesting a link farm or spamming operation. The document body, though heavily obfuscated, appears to be a lure related to a product manual, likely to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://midufefew.ru/wb?keyword=black%20and%20decker%20steam%20advantage%20iron%20manual PDF link annotation
    • https://cdn.sqhk.co/petawelesup/ljbjfuW/legend_of_the_phoenix_app_game_walkthrough.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_602de243254f6.pdfIn PDF document text
    • https://merebidoso.weebly.com/uploads/1/3/4/3/134344951/minarup.pdfIn PDF document text
    • http://cocobeautybar.ca/galaxy_note_9_review_android_centralzfb88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501659/normal_602d5371e0b57.pdfIn PDF document text
    • https://sabidodavo.weebly.com/uploads/1/3/1/4/131408103/nolaroz.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/iibjaEH/96422408503.pdfIn PDF document text
    • http://allrecipes.pro/nicki_minaj_barbie_dreams_download6zv5f.pdfIn PDF document text
    • http://topuniversityru.fun/ben_10_coloring_book_free_downloadni7d0.pdfIn PDF document text
    • http://coupons2020.info/information_technology_example_sentences7qozd.pdfIn PDF document text
    • https://taruzalo.weebly.com/uploads/1/3/5/3/135398133/kaloputowized.pdfIn PDF document text
    • http://216tilford.com/crowdfunding_websites_for_startupsn7kn6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373782/normal_603cb40a7c3e9.pdfIn PDF document text
    • http://busforpay.online/tudifaw9m4t8.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/remuv/shimano_nexus_8_speed_shifter_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/telegram_messenger_android_app.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/less_stylesheet_language.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/61879166098.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_off0000f285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 5432 bytes
SHA-256: 94bf869671477ce069a2fab93433bc48cf425e81f7c113b46a7d32d27f1253ca
font_01_sfnt_off000104f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F6 10780 bytes
SHA-256: 1f58f81a18d527632053419a43d008671e7ffcdb3a938a1da6124f3e1ab596ee

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