Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b938e7886686447…

MALICIOUS

PDF

77.5 KB Created: 2021-03-15 11:52:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3fcdca5cb5a4c70c54b6d4d9c4490881 SHA-1: 1d7342657e4566f82ff264335b3cb370ef7092a7 SHA-256: 4b938e7886686447e0e6b2809828b2ff43815abd7713eb4cce97149dbdf94c49
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to redirect users to malicious sites, possibly for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jumiwimov.ru/wix?keyword=heartland+theory+ap+human+geography+definition PDF link annotation
    • http://nukels.xyz/8418590197932l3c.pdfIn PDF document text
    • http://instapodarok365.site/pekinifezebanugeritapidalhy5om.pdfIn PDF document text
    • http://microdigitalmeter.xyz/mapijorupogajiwosogewujuhg8yi.pdfIn PDF document text
    • http://redpandarecycling.com/48052680555nb6xu.pdfIn PDF document text
    • http://republvinb.fun/9638743554cwluy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_8edbcde9afe1456ebfc69d4717476f54.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/14f5e0f2-f8c6-4a61-a16c-04faaef20bf7/76144498570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64dfeaa6-f6ce-4096-83f7-9a78d91d90d1/what_are_the_symbols_in_revelation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/537a9878-8c60-4e2f-a0f5-d6569b02e2fb/nunijut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42394dba-ea12-4c53-898a-2f956a4cd9ff/zebutomejozovokit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c40be8a4-007c-4b0a-90bd-bdb5733ed2a5/aqualink_rs6_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74ed9089-e6a8-414b-92d3-1d68e40d5302/craftsman_yts_3000_parts_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/928b7581-4b41-4330-b008-52287612bdc6/krups_nespresso_not_working_properly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b9eb7f5-1421-471d-97c2-2de67d091781/non-verbal_reasoning_practice_test_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7130ea7d-725f-49d5-9dec-2b97a82e6bfa/zipiwilizutofiferokox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ac50cee-400c-4ef3-bd75-8865199aa659/small_lowrey_organs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbf9fe66-8c87-4a51-b5db-e9a9e469b92c/7387713143.pdfIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_510e8826766a4c1a84761a61efa0fb95.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb5fbe91-b3c0-4232-9bc0-6dd1ebc936b6/sujok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f3a203b-e6ea-437d-891e-c0675ef39e0a/himno_nacional_mexicano_en_nahuatl_letra_completo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dba6499-64ac-4451-91f7-342599e0d3a7/how_fast_is_the_ferrari_world_roller_coaster.pdfIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_3ffa22710e064b1e8dc72c8b53c7592b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b16dbbf-4c15-41b5-85fc-30c8aa825132/48073785187.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_off0000e7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D9 5340 bytes
SHA-256: 45b4d2b51b7afb493ca333e1329081b8a44ccbc9af2c592ee9e8f3fb742a081e
font_01_sfnt_off0000f9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 1716 bytes
SHA-256: d7ea1fcb56881155405295582d78bbd7a96c40251f9b7d9bd0874708c9c87c0b
font_02_sfnt_off00010267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10267 11088 bytes
SHA-256: 80cb8497348ccc70e6ace871edd42cacd0eb9bf0981fe6179ce5baf3815fffe1

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