Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71a759bb1886f70…

MALICIOUS

PDF

76.6 KB Created: 2021-04-10 11:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: af94f1eb8d5424a0c7c02e89f00dfbec SHA-1: bd7dcee5085beb9c98eebed7e9b9fa41f00f9e73 SHA-256: f71a759bb1886f703954bdfd1fc3021b98325408adccc8ec9f21864b2c277f19
186 Risk Score

Malware Insights

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

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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://maypoin.ru/strik?utm_term=central+pneumatic+21+gallon+air+compressor+parts+diagram PDF link annotation
    • https://nepokotivo.weebly.com/uploads/1/3/2/8/132814168/13701e6.pdfIn PDF document text
    • http://kekijojovif.sportsontheweb.net/calligraphy_fonts_free_download.pdfIn PDF document text
    • http://fexevewuli.mypressonline.com/bachianinha_1.pdfIn PDF document text
    • https://kagebavewijove.weebly.com/uploads/1/3/0/7/130740568/rerupo.pdfIn PDF document text
    • https://cdn.sqhk.co/ratosakip/fjaib8e/pro_audio_tone_generator_app.pdfIn PDF document text
    • https://tiruzezisuwef.weebly.com/uploads/1/3/4/4/134499189/2876127.pdfIn PDF document text
    • http://folejaf.mypressonline.com/barcarolle_piano_sheet_music.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/how_to_replace_troy_bilt_carburetor.pdfIn PDF document text
    • http://toworugesolur.getenjoyment.net/86822366210.pdfIn PDF document text
    • http://pazujiz.mygamesonline.org/4210487053.pdfIn PDF document text
    • https://cdn.sqhk.co/xovinexesun/MgiXLha/kevubuzixitolis.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/fijeku_sajuzidafone_falag_gimoxuj.pdfIn PDF document text
    • https://tebozelekunoton.weebly.com/uploads/1/3/1/4/131453588/8037787.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_64cbc290637844849363407cc4ed4756.pdf?index=trueIn PDF document text
    • http://gemovimuwopete.atwebpages.com/samsung_un24h4000af_firmware_update.pdfIn PDF document text
    • http://danebusuji.onlinewebshop.net/fipifolorexoxis.pdfIn PDF document text
    • http://xafibejijopo.atwebpages.com/what_is_time_management_skills_for_students.pdfIn PDF document text
    • https://945c5b1a-9feb-4a08-b72d-c905ca1b1520.filesusr.com/ugd/27135d_7c511df2bcfa497da223e7fd31be666b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/sorurupaputezonijor.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/comprehensive_agrarian_reform_program_objectives.pdfIn PDF document text
    • http://sanugifop.atwebpages.com/square_of_numbers_from_1_to_50.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/mevibusiwunow.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/cambridge_math_book_grade_7.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB6 5484 bytes
SHA-256: 0d8fe61d4a547c54b0715f5e94ca9ac4eb00dd8c649f1c31c18fa23a79b49958
font_01_sfnt_off0000ff46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF46 11012 bytes
SHA-256: 96291b3ef3d24136cc6e01243374f2a9fad5ae2945c0ec14df8d24bbcfb5e380