Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08dbb3fd317146a…

MALICIOUS

PDF

82.5 KB Created: 2021-05-20 05:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: af6dcfe80a82457f8d9f0f82660e4f94 SHA-1: 94900c0939cffe3c356a4b655c1c2d6a4e5180e4 SHA-256: a08dbb3fd317146a9989781b0eaa39c03281c019b2a198a6a539db120541df25
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on cloud storage or personal websites, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily garbled, appears to be a lure related to religious education, which is then used to mask the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/strik?utm_term=catequesis+para+ni%25C3%25B1os+de+primera+comunion+sobre+la+biblia PDF link annotation
    • https://pixirexujana.weebly.com/uploads/1/3/4/5/134527097/zidutipigemire.pdfIn PDF document text
    • https://dedejabo.weebly.com/uploads/1/3/4/8/134875177/1669012.pdfIn PDF document text
    • https://musokuvezuref.weebly.com/uploads/1/3/1/8/131871850/a2212c4016159.pdfIn PDF document text
    • https://xilarurizajefa.weebly.com/uploads/1/3/5/3/135347329/wotesojuvipim.pdfIn PDF document text
    • https://sujujawajiz.weebly.com/uploads/1/3/5/9/135964945/topebipixilupo.pdfIn PDF document text
    • https://tegomufowake.weebly.com/uploads/1/3/5/9/135958876/55eb6da3e.pdfIn PDF document text
    • https://pibubalawuna.weebly.com/uploads/1/3/4/3/134316337/roririkuwebitogotu.pdfIn PDF document text
    • https://lasuresupaka.weebly.com/uploads/1/3/2/6/132683400/pixevemif.pdfIn PDF document text
    • https://zakazorexan.weebly.com/uploads/1/3/1/4/131407051/nemide.pdfIn PDF document text
    • https://famexowizesiz.weebly.com/uploads/1/3/4/3/134359716/wanalagodujug_gizomow_sadisegolola.pdfIn PDF document text
    • https://vumirexow.weebly.com/uploads/1/3/2/7/132740730/1775127.pdfIn PDF document text
    • https://zogeliwev.weebly.com/uploads/1/3/4/3/134353139/bopizoxunovifep.pdfIn PDF document text
    • https://rizomoxus.weebly.com/uploads/1/3/4/5/134589692/wisetokenogubej.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/limewub/77667603641.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/carnival_phantasm_sub_indo.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/pidukabaragarejopogevukum.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/char_broil_advantage_4_burner_stainless_steel_gas_grill.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/vupulusebujatinudulu.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/kupivovo.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/bhoot_sound_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/83708694362.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/forgotten_realms_1st_edition_campaign_setting.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/lenovo_t430s_wireless_drivers.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/wow_bartender_addon_guide.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_off0000f959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF959 5604 bytes
SHA-256: cdfab04eb0f9361221c89646fb9b69ff51ca903a24c95b176158671c51017689
font_01_sfnt_off00010bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFF 14832 bytes
SHA-256: eea22138665375b287f4e4656bc0eaa2a53fb35e9cfa6769e966cf43dd9ece5f

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