Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40a2cb1166f7f49…

MALICIOUS

PDF

81.6 KB Created: 2021-05-03 18:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3b7f9bd657b6c5cab1f3802f61fdd188 SHA-1: 5f9919c36e424e0aebfb312e5fae11acd69574f1 SHA-256: f40a2cb1166f7f49fee96e8cb2a693c3993ddea1fb11b8ef1ede6eaf5cfffd53
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/strik?utm_term=harry+potter+wand+quiz+playbuzz PDF link annotation
    • http://rixuliketasaban.mywebcommunity.org/kinematics_and_dynamics_physics.pdfIn PDF document text
    • http://it50disconto.pro/whirlpool_model_wrf535smbm00_filter_locationbh1pr.pdfIn PDF document text
    • http://store50off.info/70846986603ga44k.pdfIn PDF document text
    • http://prognoz-football.club/660995409404is63.pdfIn PDF document text
    • http://3-bureaureport.info/xorebinizaledop5a77.pdfIn PDF document text
    • http://wepijafiguwenan.mywebcommunity.org/54573165256.pdfIn PDF document text
    • http://saudiautoinsurance.com/ielts_academic_writing_samples_with_answerstp45w.pdfIn PDF document text
    • http://gifazat.iblogger.org/systems_engineering_certification_online.pdfIn PDF document text
    • http://viwavidif.getenjoyment.net/chrysophyllum_albidum.pdfIn PDF document text
    • http://myfavoritesun.xyz/magic_bullet_parts_mb1001bsno3e.pdfIn PDF document text
    • http://waliduv.mypressonline.com/los_acuerdos_de_paz_en_guatemala.pdfIn PDF document text
    • http://milesatel.mygamesonline.org/autobiography_of_a_yogi_marathi_download.pdfIn PDF document text
    • http://gnfcns.info/8408683028412bnb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_a02243645b77472d810b12efeb050894.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zunaporam/maths_crossword_puzzles_with_answers_for_class_8.pdfIn PDF document text
    • http://dorowoz.rf.gd/header_file_download_php.pdfIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_0243b5e8b7c340eb83f8c147dac4e275.pdf?index=trueIn PDF document text
    • http://wugulinutefi.rf.gd/year_5_creative_writing_worksheets.pdfIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_880424c9f1134b7096647263b054f6f8.pdf?index=trueIn PDF document text
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_c0d29b72c915408aac7e4e312e03314d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuniku/automation_game_crack.pdfIn PDF document text
    • http://derekage.epizy.com/fomabebuxola.pdfIn PDF document text
    • http://bejitepirisobi.epizy.com/negulutatiwuduro.pdfIn PDF document text
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_d986d92c469b4dc588c99f010220c0eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/74742502886.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/how_to_clean_cuisinart_ss-700_coffee_maker.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 5128 bytes
SHA-256: 5d13e599d51a8cdf70fa369c83bcf4e4e9f882adc5d3a546879eff67279d5fe9
font_01_sfnt_off000104c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C2 10992 bytes
SHA-256: 74efde0a1f4d8cd2a3c179471acda2319d3cc8ff19e76f1c1241f5d09f77aa28
font_02_sfnt_off00012a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A06 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176