Malicious PDF — malware analysis report

Static analysis result for SHA-256 57220524a6e6f841…

MALICIOUS

PDF

77.8 KB Created: 2021-06-09 02:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4da30f554f0827d041ca6d0e255083a8 SHA-1: 4ac35a2966e1b3365656e7d612c44741c85aeaa1 SHA-256: 57220524a6e6f84140e8e883802f6975cc0a3b7222df59240f435190cb1a0f8b
156 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that mimics a search engine result for a common educational query. This technique is often used to direct users to malicious websites. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, suggesting a link farm designed to improve search engine ranking or distribute malicious content. ClamAV detection further confirms the malicious nature of the file.

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-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://baarspo.ru/wb?keyword=how%20to%20do%20trigonometric%20ratios%20on%20a%20calculator
    • https://javekulu.weebly.com/uploads/1/3/1/8/131872149/4761176.pdf
    • https://cdn-cms.f-static.net/uploads/4405185/normal_6032e33e136ca.pdf
    • https://cdn-cms.f-static.net/uploads/4490539/normal_60bb283b725de.pdf
    • https://cdn-cms.f-static.net/uploads/4446762/normal_60ba92fdf1553.pdf
    • https://bapamebitisetup.weebly.com/uploads/1/3/4/3/134325238/003913021a07e.pdf
    • https://gadolelexuzited.weebly.com/uploads/1/3/4/4/134486477/2394213.pdf
    • https://zajefogana.weebly.com/uploads/1/3/1/4/131407312/ded650606c5.pdf
    • https://cdn-cms.f-static.net/uploads/4378606/normal_6021c6b3ad0bf.pdf
    • https://cdn-cms.f-static.net/uploads/4454681/normal_605efd69a99e3.pdf
    • https://cdn-cms.f-static.net/uploads/4418178/normal_6026b6e233cb9.pdf
    • https://cdn-cms.f-static.net/uploads/4415934/normal_6043491ba4896.pdf
    • https://cdn-cms.f-static.net/uploads/4476567/normal_6032228af3fc0.pdf
    • https://notebatamigoxaw.weebly.com/uploads/1/3/4/7/134715817/183430.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vawijoj.pbworks.com/f/19127022718.pdf
    • https://uploads.strikinglycdn.com/files/cc023127-d927-4d87-8ecd-ea2084a4c39e/estudio_de_factibilidad_libros.pdf
    • https://uploads.strikinglycdn.com/files/f1988264-01fb-4d0e-85b4-9b6333c6916e/omission_of_relative_pronouns_exercises.pdf
    • https://uploads.strikinglycdn.com/files/e4a58cbb-cc6a-4cf6-8b06-63d9170075d8/clover_mini_iron_ii_australia.pdf
    • https://uploads.strikinglycdn.com/files/d001e5e3-c199-4393-bbb1-3906759d7919/delonghi_ec702_15-bar-pump_espresso_maker_stainless_metal.pdf
    • https://uploads.strikinglycdn.com/files/4bfac65f-c7d2-463d-90ed-3de469e7a331/lulemuz.pdf
    • http://risuxujuvu.pbworks.com/w/file/fetch/144483474/kis_desh_mein_hai_meraa_dil_all_episodes_free_download.pdf
    • https://uploads.strikinglycdn.com/files/42d03606-b5e4-4fc3-996d-a69facef0c4c/mopejevebemeke.pdf
    • https://uploads.strikinglycdn.com/files/557cef9b-8edd-4e4a-807a-aa1db2231452/are_volcanoes_bad_for_the_environment.pdf
    • https://uploads.strikinglycdn.com/files/f6606178-d224-4c28-b0f6-20abcf8bd351/what_is_knowledge_of_god_in_the_bible.pdf
    • https://uploads.strikinglycdn.com/files/a57ccb21-9580-4025-9201-fb6249729501/97224533776.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c2.bin
9d1cb77a207be738daaf58592329405f8bcf38d08e27741fa0fb6cdcc399d495
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C2 5312 bytes
font_01_sfnt_off000104c9.bin
a16587dfb5b8aaa82d7f30cf5f16aa27152d651f38b5c8b6664804b8e9974702
pdf-font-stream PDF embedded font (sfnt) at offset 0x104C9 10748 bytes