Malicious PDF — malware analysis report

Static analysis result for SHA-256 723ce00f20f36500…

MALICIOUS

PDF

72.5 KB Created: 2021-01-12 00:18:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 66074669378894d63a6fe81acf8da33b SHA-1: bca148e969abc39b1755c82b7928dc5bed9ede7d SHA-256: 723ce00f20f365005d0fc994933a8cf8e2b35355a75974f82def2f696e96a806
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm designed to obscure malicious activity. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://trafffi.ru/123?utm_term=internet+safety+games PDF link annotation
    • https://site-1174796.mozfiles.com/files/1174796/high_volume_instrumental_ringtones_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mewobonovagi/cejahcz/crazy_football_facts.pdfIn PDF document text
    • https://site-1205776.mozfiles.com/files/1205776/mint_slice_ice_cream_recipe.pdfIn PDF document text
    • https://site-1171131.mozfiles.com/files/1171131/fenuvalomaratakavixo.pdfIn PDF document text
    • https://mivebomuponi.weebly.com/uploads/1/3/1/3/131398008/5044bf942d40d.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/vonusirukete/types_of_balance_of_power.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/calpers_death_benefit_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/kalufizefem/mubowepawomewasamozimobud.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/tobigibadovigekejopasofin.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/10346613429.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/3916723310.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_off0000d479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD479 4724 bytes
SHA-256: 2086d1a6d3fe589d86d8872c18712eca5a6736b01bb438a45a00879b28d75714
font_01_sfnt_off0000e465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE465 10332 bytes
SHA-256: 20ff5dba074b9693cc835e90a8b0c7f4e0189519cf232fb62df2df84adf97166
font_02_sfnt_off00010779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10779 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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