Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ebe80be7d2fe89e…

MALICIOUS

PDF

64.9 KB Created: 2020-11-13 02:41:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ce65b2e81b334640a418d21447f7a2e SHA-1: d096e2268c2185f0c402ebcf40e8eddbf53742b4 SHA-256: 1ebe80be7d2fe89e7658b98d430ee0905c77dacf55cd8fef9b15f8c86bf24007
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of external links, many pointing to other PDFs, suggesting a link farm or redirection mechanism. The primary URL, 'https://trafftec.ru/strik?utm_term=3000+solved+problems+in+physics+book', is likely used to lure victims under the guise of a book title.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/strik?utm_term=3000+solved+problems+in+physics+book
    • https://cdn-cms.f-static.net/uploads/4423732/normal_5fa1fffcc5d30.pdf
    • https://cdn-cms.f-static.net/uploads/4389370/normal_5f91f867936de.pdf
    • https://sobaxijuxoje.weebly.com/uploads/1/3/4/2/134235367/7911809.pdf
    • https://cdn-cms.f-static.net/uploads/4366676/normal_5f871d2d558ea.pdf
    • https://zupipozove.weebly.com/uploads/1/3/4/5/134589893/1789850.pdf
    • https://cdn-cms.f-static.net/uploads/4386089/normal_5fa1f84f848d4.pdf
    • https://cdn-cms.f-static.net/uploads/4373301/normal_5f8b525e6c16c.pdf
    • https://cdn-cms.f-static.net/uploads/4413697/normal_5fa22fdb1751f.pdf
    • https://cdn-cms.f-static.net/uploads/4475406/normal_5fa681786cd34.pdf
    • https://cdn-cms.f-static.net/uploads/4379483/normal_5f8fc3a278c3f.pdf
    • https://werifetez.weebly.com/uploads/1/3/4/6/134696790/a01517ca40207b.pdf
    • https://cdn-cms.f-static.net/uploads/4369486/normal_5f8dfff8e93ae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/0f6d67ae-7f45-4184-bc2b-d9354c339bb3/99684361838.pdf
    • https://uploads.strikinglycdn.com/files/8a42b546-fd39-4570-b7cc-66fdc583554e/jumbo_tile_frenzy_game_free_download.pdf
    • https://uploads.strikinglycdn.com/files/fbfd605f-8c03-4b8f-a6e3-3521adc3e3ca/dekapazaruvixijinusebosu.pdf
    • https://uploads.strikinglycdn.com/files/ef4e00dd-9f38-4525-91ea-ea6d552349ca/xuloninet.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b408.bin
4a0d91f5910711f9d116b05f7cc6ff17ffdba100d5f41a556f4c204330241f1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB408 5388 bytes
font_01_sfnt_off0000c614.bin
6242350f9b9266d95715565a04356463009b5dde895ebde0b640d1a98b52dbe4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC614 10040 bytes
font_02_sfnt_off0000e859.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE859 4324 bytes

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