Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2759276aaa85e9d…

MALICIOUS

PDF

80.3 KB Created: 2021-03-18 03:29:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17375dcc13bc61c2ac3351d5e47abdb2 SHA-1: 8e9a9dbdb081a98ece2dc54432269666bd9ae790 SHA-256: a2759276aaa85e9d23ede09adefbdf62a025354491791de311fcabfcdfdbe8a3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one suspicious URL pointing to 'seumenha.ru', suggesting a phishing or malware distribution attempt. The PDF structure and embedded content, though partially obfuscated, are consistent with techniques used to disguise malicious links within seemingly benign documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=how+to+cite+a+recipe
    • https://jepigosewuva.weebly.com/uploads/1/3/2/3/132302921/5856204.pdf
    • https://sukodijam.weebly.com/uploads/1/3/4/5/134516983/vefiperamuxozodabuja.pdf
    • https://josozigigararu.weebly.com/uploads/1/3/2/6/132681886/3744294.pdf
    • https://balijijileg.weebly.com/uploads/1/3/4/5/134505585/21ac245f4edf7.pdf
    • https://jotutavujisab.weebly.com/uploads/1/3/1/1/131164129/4810683.pdf
    • https://bebujufexuxiki.weebly.com/uploads/1/3/4/6/134624407/854953.pdf
    • https://vogoniboka.weebly.com/uploads/1/3/1/0/131070279/1142037.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_e4a5145991a04397b5d73c9e906b9e53.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dab01b73-9d4a-403c-a2c6-fb7d0d75632b/how_to_lose_weight_fast_no_exercise_no_diet.pdf
    • https://4461694d-a6f7-4a69-895a-ff5ddeb3c622.filesusr.com/ugd/f504fb_f03ef22198044c909c8c38207e10f6e9.pdf?index=true
    • https://d23eb412-52e1-45ef-a32a-0c032022daee.filesusr.com/ugd/03485a_c76118b38eb24c3bb671e00243a63bb4.pdf?index=true
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_f414817b566a4fcdbe236c600351b5d7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/342636a3-6f4d-46bd-b0f8-7b614d9902de/best_selling_astrology_books_in_india.pdf
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_bf97567ab3374644b470353d664651f2.pdf?index=true
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_120f056423c34849afdd83b7fe4082c6.pdf?index=true
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_4c8fbc964c824de2be0e5c6e634926b5.pdf?index=true
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_70089ba007f44edcbf70a6b372fd0ff9.pdf?index=true
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_af59f4f1034344738a69ba9d4baf1aad.pdf?index=true
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_0508258002bb4d5aa9628b67f5589f51.pdf?index=true
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_0a2369e4cb0d4c6682cbf9370b1e63e9.pdf?index=true
    • https://39c3e2ba-dcb8-4bc0-9ed7-0058f02c59d5.filesusr.com/ugd/fd4c29_679df58b59df47e797c5c377b09d3944.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe40.bin
ab584a2ba57a8b33955e2ef6e04dae187f588ea3289df9b2d97ef2bfe9a3fa5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE40 4768 bytes
font_01_sfnt_off00010e98.bin
3ec0129961dd4628b93b3942babc131b7037c911de5444a117b834a0d741eb1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E98 10836 bytes

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