Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae55f11e82af2b5…

MALICIOUS

PDF

72.3 KB Created: 2021-03-25 16:26:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c2ac472fd4e28783817749a6e1eb9c63 SHA-1: a48e185991c01bb1efda8d39488291c91ba22d32 SHA-256: 9ae55f11e82af2b574562a44507e5fd7838cf7ff159989bb064128b164abbec6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous external links, many of which are part of a link farm. The presence of a 'download button' lure suggests a phishing or scam attempt. The document's content, though heavily obfuscated, appears to be related to a PDF download, aligning with the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=darker+as+told+by+christian+grey+pdf+download PDF link annotation
    • http://triple-doska4.club/60910379066ch38f.pdfIn PDF document text
    • http://kipigonatusa.iblogger.org/vuwisujomopa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409604/normal_5ffdac83c326a.pdfIn PDF document text
    • http://doctorzlo.com/64583082739pdjtg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444100/normal_60147887daf6c.pdfIn PDF document text
    • http://wukosemat.22web.org/reporting_japanese_knotweed_northern_ireland.pdfIn PDF document text
    • http://shoppingyxplus.xyz/ccna_routing_and_switching_complete_study_guide_200-1254p7kc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465702/normal_60072fa4c76bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369782/normal_602003b102b7a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vituzitozitu.epizy.com/trumpet_voluntary_stanley_organ.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/89258715304.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/gugasopaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/72041319944.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/bigokapuzibowija.pdfIn PDF document text
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_91e53d65044d4c8984bf423d9fafebfc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fovezewi/pct_applicant_s_guide_national_phase.pdfIn PDF document text
    • https://d397443b-80d0-4e74-967c-4ce830ee3754.filesusr.com/ugd/0a76f0_3bbc5630e2b24c55ab0f9b464b3f1469.pdf?index=trueIn 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_off0000dc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3E 5816 bytes
SHA-256: 629d9c877cdb1ff6de6573dae1600612ca7147d6503cab5cddf1592003285bbb
font_01_sfnt_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 10432 bytes
SHA-256: d1106906375c495fe049d9953dc04862d81d3ae3abc4786762777fec7ec769e0

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