Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5b14b4b010be67…

MALICIOUS

PDF

89.5 KB Created: 2020-12-19 00:55:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8d29651577f55706705765c34315d4ff SHA-1: 3d11dab8cf49216fa305483cdd07974092aff6a3 SHA-256: 3f5b14b4b010be67db8baeb133d58d6a079e15c30fffa7380f4d6b28bc917012
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirector infrastructure or are part of a link farm. The heuristic firings indicate the document is a malicious redirector and has been flagged by a machine learning classifier as malicious. The embedded URLs are likely used to direct users to phishing sites or download further malicious content.

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://gettraff.ru/123?utm_term=uf+football+stadium+directions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379387/normal_5f8dc489e1c20.pdfIn PDF document text
    • https://wuxavumitot.weebly.com/uploads/1/3/4/6/134683172/ruvalizelotepa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_5f8dcc68c37a4.pdfIn PDF document text
    • https://najunores.weebly.com/uploads/1/3/4/3/134381484/2221320.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420761/normal_5fae9157af957.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/dukavunivifa/sumumebebawura.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/58189431247.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/cub_scout_book.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc290cdf9866f3fd2dedb6b/t/5fc74552b7521d608a42ce90/1606894931394/bengali_detective_story_mp3_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dcb70be-e1c7-45e1-afac-59bc44f62edb/a1_appliance_repair_tulsa.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/informal_team_meeting_minutes_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13624c16-1a60-4bab-8511-fcfc627edf8a/freeman_biological_science_5th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/fupunoxujulajowi.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_off0001208d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208D 5296 bytes
SHA-256: 59d3d983e51c0becdb570d1bb6f111fbc1787470721b929fd0e0408f6071727d
font_01_sfnt_off0001327d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327D 11520 bytes
SHA-256: b2e28cee7bc5c46693d5f13e72dfe8be8060d063477d9c39c4cb9cf39e582264

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