Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ba77aec9ef235b2…

MALICIOUS

PDF

78.5 KB Created: 2021-03-15 06:26:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4256ab1dc68e5d4838d77a93f0cdcf5b SHA-1: 728e163b3a9bef1ca20a4068f1e37165a085c477 SHA-256: 2ba77aec9ef235b2a6a95d32d25fff88ef656a676c150786d0656184f8800b15
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a large link farm. The 'SE_INVOICE_LURE' heuristic suggests a deceptive intent, likely to trick users into downloading further malicious content. While no scripts were directly extracted, the presence of many external links, including one pointing to a potential second-stage PDF, indicates a downloader or phishing attack pattern.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://nipisod.ru/award?keyword=advertising+company+portfolio+pdf PDF link annotation
    • https://cdn.sqhk.co/disidudi/egdjbhe/biramokijusedivifewexa.pdfIn PDF document text
    • https://cdn.sqhk.co/viforoge/shc2cgf/bemelogasukel.pdfIn PDF document text
    • https://cdn.sqhk.co/berulenogo/ZMjekiR/gudumejolunulefasen.pdfIn PDF document text
    • https://cdn.sqhk.co/lomekojop/gjkZzHn/16380737605.pdfIn PDF document text
    • https://cdn.sqhk.co/fenozidu/8u0iahh/mini_glider_balance_bike.pdfIn PDF document text
    • https://cdn.sqhk.co/vamosopon/bidQ7yd/huey_helicopter_models_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/W7iU6ya/100_years_love_with_a_vampire_new_orleans.pdfIn PDF document text
    • https://cdn.sqhk.co/wotabefej/henfZjh/58895481252.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/e1c318af-2255-4af2-bed1-b9834b417728/in_pairs_roblox_lua.pdfIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_afb6efb9cc424d078056c31f4195a153.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fccf771f-1bf2-4bcd-a796-67ad00198b75/93768884236.pdfIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_146da62869444ea3936181f28adaecbf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/08e95229-1342-4b67-85f0-c371dcfcd121/stanley_fatmax_8_amp_charger_troubleshooting.pdfIn PDF document text
    • http://pedijuwugeta.rf.gd/buzebelinaguziribeta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a6ba4c5-f948-4abf-bf1b-54152b539879/1001_spells_book_review.pdfIn PDF document text
    • http://rokupin.rf.gd/android_one_xiaomi_update.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_off0000f270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 5628 bytes
SHA-256: 1b76de159d7cd7005fc1122066f1f4f94514f40a10d76b98d5cb4d7d33a70640
font_01_sfnt_off00010594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10594 11640 bytes
SHA-256: df3c8b6be4106abe38ba637958f1670194f53721e4d5e9e90a3eea2cbaa2a059

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