Malicious PDF — malware analysis report

Static analysis result for SHA-256 843ce9cf9ec056fe…

MALICIOUS

PDF

68.5 KB Created: 2020-11-26 10:25:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 63e791e9ab45642bc9de6a62b2b136c6 SHA-1: 00e785d2c6dd54e7fbde7f6839f8da415f7aa9a9 SHA-256: 843ce9cf9ec056fe094b293a929a6c2237c098881eb039be791b4333e9b09be2
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV also flagged this file as malicious. The presence of numerous external links suggests an attempt to direct users to potentially harmful websites, possibly for phishing or to serve further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=fundamentals+of+electrical+circuits In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5f8d92d61a5e9.pdfIn PDF document text
    • https://rigokapine.weebly.com/uploads/1/3/4/5/134593974/7877865.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419654/normal_5fa0dc39e072f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486356/normal_5fb2dd91d9897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412408/normal_5f9d8b43010ce.pdfIn PDF document text
    • https://surafevigenirax.weebly.com/uploads/1/3/4/6/134610600/wajufodedodijunilot.pdfIn PDF document text
    • https://bogigusojuvifu.weebly.com/uploads/1/3/4/3/134316749/kezamimopazaxof.pdfIn PDF document text
    • https://sonilotosoj.weebly.com/uploads/1/3/1/3/131379329/6c9af25b9d20.pdfIn PDF document text
    • https://jilukixewe.weebly.com/uploads/1/3/4/0/134042659/busokulegafajuzisesu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369648/normal_5f95e5d973697.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/vipinib/boll_and_branch_sheets_pilling.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/google_sheets_send_email_on_change.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/calvary_temple_jesus_naa_songs.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_off0000d0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BA 5124 bytes
SHA-256: 778d342d5b19bad4b9e38bec6f3c5071754349bb424ed89c820804fb93e249c5
font_01_sfnt_off0000e215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE215 10176 bytes
SHA-256: 19cbdcda57e4c16deb13bcc5302e4a5bbedc83f575565b5d94c161c252865ddc

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