Malicious PDF — malware analysis report

Static analysis result for SHA-256 db017159f91c1660…

MALICIOUS

PDF

71.9 KB Created: 2021-02-12 19:47:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 45b7ac3aca77f712ec1873dac7e07074 SHA-1: 04a86cb333a72dd81439d5e7a143bb9d55ae06b0 SHA-256: db017159f91c1660d8b3bc8d72a28f7729a5d11f86d2fe8b804e5b6de0949559
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical finding for a "PDF_SEO_LINK_FARM" and ClamAV detection as "Pdf.Phishing.Trojan". The presence of numerous external links, many pointing to PDF files on unknown domains, suggests a phishing or malware distribution attempt. The document's apparent content as a "Bass fingering chart" is likely a lure to disguise its malicious intent.

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.
  • 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://crophysi.ru/123?utm_term=bass+fingering+chart PDF link annotation
    • http://livecopyrightverification.com/casino_magic_free_slots_machines816k0.pdfIn PDF document text
    • https://duzigolanulemo.weebly.com/uploads/1/3/2/6/132680867/2a2068bca64.pdfIn PDF document text
    • https://bepefuligifeval.weebly.com/uploads/1/3/5/9/135981888/gebab.pdfIn PDF document text
    • http://topsalon.xyz/action_centered_leadershiprte5o.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/eXf2igV/biwopenitoxuxudemu.pdfIn PDF document text
    • http://bilkan.fun/dmarc_report_analyzer_linuxyn1mf.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/62Qxiay/48323601253.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/radubozufiwo/99758493070.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/33300100644.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/sizujo.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/chelsea_vs_barcelona_2-_2.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/gravitational_potential_energy_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/lumuxewu.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/moseborevukufasaxureta.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_off0000cfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE3 3116 bytes
SHA-256: d1f441e16975810d0a92e1cc0862960195edc5effb32751d6ceadec7d51088ca
font_01_sfnt_off0000db1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1A 5160 bytes
SHA-256: 51bb3a5651e6670dd761f7b9b507d0c97c734217507a20368f492557247a4ed2
font_02_sfnt_off0000eca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA8 11132 bytes
SHA-256: e59635e353d2b90400a70bd303b789c581474e67a55d83bc81e2f5eb2145d90c

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