Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5ecb1d60348a48…

MALICIOUS

PDF

81.7 KB Created: 2021-06-14 22:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6b81ca6bc5f17d2bb060f72265e6e5d SHA-1: 79025b806c124283ec5a756649fc32d9fceaa2b0 SHA-256: 4e5ecb1d60348a4876060f3677c0c901262ae601592e737df9868677ea425cb2
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier. It contains an embedded URI pointing to 'ketchas.ru' which is presented as a movie streaming link, a common lure for phishing or malware distribution. The PDF also contains a large number of external links, many of which are likely part of a link farm, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/pbw?utm_term=spy+2015+full+movie+watch+online
    • https://tanaxafim.weebly.com/uploads/1/3/4/5/134501517/9293565.pdf
    • https://nugatifijomit.weebly.com/uploads/1/3/4/7/134715362/dejexasepugi.pdf
    • https://povebosi.weebly.com/uploads/1/3/5/3/135346093/9236967.pdf
    • https://wovuwujofisup.weebly.com/uploads/1/3/1/8/131856276/2496986.pdf
    • https://godikifamubexi.weebly.com/uploads/1/3/4/6/134622632/c5b201cc658d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vulifib.pbworks.com/w/file/fetch/145261722/zibilalexarili.pdf
    • https://uploads.strikinglycdn.com/files/660bafdd-1f63-4523-9c6a-ade48361461f/77270163748.pdf
    • https://uploads.strikinglycdn.com/files/0be9e329-7347-459c-97c6-5909e66356db/vuxirizulumerujota.pdf
    • https://uploads.strikinglycdn.com/files/04615c70-c105-4b65-a330-2fe041d3a2dc/75913848433.pdf
    • https://uploads.strikinglycdn.com/files/e306f4ef-c0a0-4d66-936f-76f4858999b9/what_is_the_best_heart_health_diet.pdf
    • https://uploads.strikinglycdn.com/files/75d34948-6496-450a-9ab3-c99e2965ecae/takelib.pdf
    • https://uploads.strikinglycdn.com/files/709a50bd-c311-452e-975f-86e320cdacd9/limites_de_funciones_vectoriales_ejercicios_resueltos.pdf
    • http://bowawesup.pbworks.com/w/file/fetch/145082961/logical_fallacy_worksheet.pdf
    • http://ruwezebom.pbworks.com/w/file/fetch/144700140/pupituvalezogitad.pdf
    • http://liguduper.pbworks.com/w/file/fetch/144865365/zododubirilabivujawirupe.pdf
    • https://uploads.strikinglycdn.com/files/ae8841b1-ed9c-4cb6-bd32-39e925fa9cc0/nikon_n80_digital_camera.pdf
    • https://uploads.strikinglycdn.com/files/d065433b-24de-43b7-87b7-a848f8837387/vutawepubadanotuvajerute.pdf
    • http://namimutigete.pbworks.com/f/catherine_ponder_dynamic_laws_of_healing.pdf
    • http://sawebaz.pbworks.com/w/file/fetch/144704931/tafoleximajegijij.pdf
    • https://uploads.strikinglycdn.com/files/c9120f7c-7f67-4b4d-a39a-74920f55d3db/jixodutimixinirases.pdf
    • https://uploads.strikinglycdn.com/files/bfcf2b1f-5988-4162-a439-0fbe3c362a37/aviation_weather_metar_history.pdf
    • http://guvevef.pbworks.com/f/74399629464.pdf
    • http://gibuwodebu.pbworks.com/w/file/fetch/144492291/is_canidae_good_for_large_breed_puppies.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_off0000f315.bin
99a0cce8f31b11a736010d2213558961f2190e9ade328834102084e4d6ebd097		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 5668 bytes
font_01_sfnt_off0001066b.bin
c5a54c2d0ce60694157382422251a9158625fd9adb0e8fb3980710aadfef2547		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1066B 10680 bytes
font_02_sfnt_off00012ae0.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE0 4324 bytes

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