Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c51fabc1a96ae2…

MALICIOUS

PDF

70.5 KB Created: 2020-11-13 13:28:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 63698b4f6912cba15a7e5b5a9cb37f1d SHA-1: bee89b83a2ab46ef1f7cc9b74a0679c2bbe1708b SHA-256: 23c51fabc1a96ae250d61ea66db465c94b3362055ceaa4dc063be9dfe3bf9df8
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which point to link farms hosted on services like Weebly. One critical heuristic indicates these links lead to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=skulls+and+shackles+player%2527s+guide In PDF document text
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/ff36e3c4cbca.pdfIn PDF document text
    • https://xamudoniganotew.weebly.com/uploads/1/3/4/5/134509964/zizitaderasuzifodo.pdfIn PDF document text
    • https://fobedixosofano.weebly.com/uploads/1/3/4/3/134377241/1181618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457604/normal_5fae211ad1a10.pdfIn PDF document text
    • https://woxevodojagub.weebly.com/uploads/1/3/4/6/134623787/pixatetegi.pdfIn PDF document text
    • https://pesajupamobe.weebly.com/uploads/1/3/1/6/131607203/b109f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409616/normal_5faab7d795590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5f8c408e02f6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382782/normal_5f8ce62e3ee37.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://uploads.strikinglycdn.com/files/c91d77e5-fe19-467c-9d5c-540c6f8912a0/16345437233.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eae84770-3eb6-4331-ace4-f25b99d4ce56/elder_scrolls_legends_deck_tracker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/397bb629-ade5-417d-a73f-40c4ea85c1fa/76197089065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/528902d1-62fc-4ccb-ade2-3653c32cf788/58983862122.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE37 3028 bytes
SHA-256: a8bb295adce06666852798224f8c17cf63d4c16f7697ae4b42c723da0a07d689
font_01_sfnt_off0000c913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC913 5328 bytes
SHA-256: 8045d691181b028dcb6348e3d47cf8d03fa26c00e6b9916cf63be95a8d11234a
font_02_sfnt_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 10324 bytes
SHA-256: 44a141a9d702c7b6df42f33b5a38c071be1e70658487c0636e99963efb16953b
font_03_sfnt_off0000fe8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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