Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1aa64df7881452a…

MALICIOUS

PDF

75.5 KB Created: 2021-03-14 15:43:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 282b68a7181b1d3e380bec1da86b031e SHA-1: 5d52f96e95d0aac382954be56c4b5117ddd1d075 SHA-256: b1aa64df7881452aaa0d9c565cec317c80a296ee375204909e2ad8383ac33fda
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical finding for a link farm and ML classification indicating maliciousness. The document body, though heavily obfuscated, suggests a lure related to book collections. The presence of numerous external URLs, many of which are unknown or suspicious, indicates an attempt to redirect users to potentially malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=tintin+24+book+collection PDF link annotation
    • http://nesebonuvobeju.getenjoyment.net/qcy_price_malaysia.pdfIn PDF document text
    • http://hookup153.online/the_gulag_archipelago_abridgedihs3m.pdfIn PDF document text
    • http://epaytds.xyz/what_is_sculpture_block_made_ofsawr7.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/how_to_install_honeywell_wifi_smart_thermostat_rth9580wf.pdfIn PDF document text
    • http://medazuxa.mywebcommunity.org/bsc_1st_year_physics_book_download_in_tamil.pdfIn PDF document text
    • http://onlinetyz.xyz/cub_cadet_rzt_50_transmission_fluid24w56.pdfIn PDF document text
    • http://xagixowedobosab.medianewsonline.com/download_microsoft_xbox_360_controller_driver_windows_7.pdfIn PDF document text
    • http://wozupabalaviv.medianewsonline.com/fosivaraw.pdfIn PDF document text
    • http://bumaga.bz/12035533860o7rek.pdfIn PDF document text
    • http://posadukik.getenjoyment.net/93151190428.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tetenifeme/78899091087.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/57270710533.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/cong_dung_thuoc_metformin_stada_850mg.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/89923834548.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/10_tab_divider_word_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/nalirulofojowubotizonuro.pdfIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_d93c52da802340a6b76cf3266230f648.pdf?index=trueIn PDF document text
    • http://jowosos.myartsonline.com/lawene.pdfIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_32b69edbb246414eaa602bf829ae3c23.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/13188557772.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8F 4472 bytes
SHA-256: 2e1f332fb0e92d1d389029f02733abbee03fe709566ad863682221fa7bcb68e4
font_01_sfnt_off0000ebd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD0 10976 bytes
SHA-256: 4086a7dd06adc44cdc983f23c181040303910433954f93d0ae2970da855f61f3
font_02_sfnt_off00011141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11141 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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