Malicious PDF — malware analysis report

Static analysis result for SHA-256 0621783792748873…

MALICIOUS

PDF

107.3 KB Created: 2021-05-02 05:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae5fbe04b243d694520255d87a2eae6e SHA-1: 9bcab45db4b598a3bf97c29ac85cdb759235009b SHA-256: 062178379274887327aa9f61afe23c596b131a29ac078a9e7c31eb01ac408653
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to drive traffic to various websites. One of the primary URLs, https://botokaw.ru/strik, is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://botokaw.ru/strik?utm_term=why+do+we+want+to+hurt+ourselves
    • http://jokojujut.medianewsonline.com/are_apple_books_free_to_download.pdf
    • http://samyog.ru/diagrama_de_caso_de_uso_de_negocio_ejemplosoa6pm.pdf
    • https://nufusuninad.weebly.com/uploads/1/3/4/6/134609023/ed11f4941765362.pdf
    • http://pipvip.ru/fanupitapobtedmq.pdf
    • http://kejurudoji.medianewsonline.com/blood_type_ab_diet_food_list.pdf
    • http://wwwbcpzonasegura-viabcp.com/the_pit_and_the_pendulum_characterswfruo.pdf
    • https://bugajujifupub.weebly.com/uploads/1/3/4/8/134894919/cece81763.pdf
    • https://zizopozuwugova.weebly.com/uploads/1/3/0/7/130775786/rababowemini.pdf
    • https://widafesisitix.weebly.com/uploads/1/3/5/3/135321065/62783b4c.pdf
    • https://dubozenerur.weebly.com/uploads/1/3/4/6/134687155/raxat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/suximawo/speech_in_the_virginia_convention_questions_answers.pdf
    • https://s3.amazonaws.com/liwafo/causes_of_poverty_in_uganda.pdf
    • https://s3.amazonaws.com/zobuwubedak/petiwina.pdf
    • https://s3.amazonaws.com/regufojalojaza/minecraft_1._12_2_cracked.pdf
    • https://s3.amazonaws.com/jalasilunaz/43962531611.pdf
    • https://s3.amazonaws.com/divelatoxa/71963884391.pdf
    • https://s3.amazonaws.com/bokofapig/metformin_hydrochloride_vildagliptin_galvus_met.pdf
    • https://uploads.strikinglycdn.com/files/faa734f8-5c02-4efc-960c-2987d3391734/who_plays_trevor_in_after_we_collided.pdf
    • http://gosaduzunake.myartsonline.com/caracteristicas_del_apriorismo.pdf
    • https://s3.amazonaws.com/muvemasoxaji/blade_runner_2049_free_reddit.pdf
    • https://uploads.strikinglycdn.com/files/7bbbc127-6f2d-4f60-b944-8ecf2c9e26a8/asus_rt-ac68u_change_ip.pdf
    • https://uploads.strikinglycdn.com/files/9d51a977-7976-4e5b-a4ba-b94c6608c12e/32059253759.pdf
    • https://uploads.strikinglycdn.com/files/12606c6c-0a77-4206-8b25-54aae499ecd7/17876668512.pdf
    • https://s3.amazonaws.com/vetamedisoz/daxoba.pdf
    • https://uploads.strikinglycdn.com/files/297e80f9-40f5-4369-8872-c7229ca49086/kevalesologumafogu.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_off000167f0.bin
1dcfe9b39c462ff720eb51e7d2017ce5a9b6b0009f582cdbd15cd210bc56b486		 pdf-font-stream PDF embedded font (sfnt) at offset 0x167F0 5180 bytes
font_01_sfnt_off000179a9.bin
bc154ab8bfb8593ba51aad32532f651c9f06bc225c5e19605a60274c6035f746		 pdf-font-stream PDF embedded font (sfnt) at offset 0x179A9 10900 bytes

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