Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51c4f5cef1d6ee1…

MALICIOUS

PDF

93.0 KB Created: 2021-03-27 19:01:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 17b63816a1d3682e1ffb1041ca3fcbc5 SHA-1: 939e3047728124eeacff024839aca7c3674096ab SHA-256: f51c4f5cef1d6ee1dd39398bf477de09daeea95bfa1e6aa624603545103b52cd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://maypoin.ru/wix?keyword=realidades+2+capitulo+5a-3+answers PDF link annotation
    • http://fuvisetitisenon.mypressonline.com/dalilafanetinusurizefib.pdfIn PDF document text
    • https://cdn.sqhk.co/zolilobup/jaaRbhj/mogama.pdfIn PDF document text
    • https://cdn.sqhk.co/dukizukijire/iiDL5gf/zikubanekaxenuvogemudowoj.pdfIn PDF document text
    • https://cdn.sqhk.co/xavipinav/6iihaja/xuwixit.pdfIn PDF document text
    • http://waguzeb.66ghz.com/22628116349.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/58062727741.pdfIn PDF document text
    • http://mevixonur.mywebcommunity.org/87355247043.pdfIn PDF document text
    • https://cdn.sqhk.co/mixukavusu/iitgchi/globe_prepaid_promo_call_and_text_and_data.pdfIn PDF document text
    • http://lumejaramelu.mygamesonline.org/gaxewazenegamuxatulibeg.pdfIn PDF document text
    • https://cdn.sqhk.co/navuwamas/uzggggi/rigijazunozepuwazolil.pdfIn PDF document text
    • http://nujagexurej.medianewsonline.com/computer_network_technician_trade_school.pdfIn PDF document text
    • http://dojisef.iblogger.org/rabinewuzefixa.pdfIn PDF document text
    • http://wulurag.mygamesonline.org/customs_clearance_procedure.pdfIn PDF document text
    • http://pidijajuwupurop.medianewsonline.com/apiculture_project_download.pdfIn PDF document text
    • http://biwadevebudorif.22web.org/gujoxuzijukuxen.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
    • http://dexizijisub.atwebpages.com/cost_accounting_a_managerial_emphasis_chapter_5_solutions.pdfIn PDF document text
    • http://mutoris.rf.gd/79273066583.pdfIn PDF document text
    • http://voruluju.epizy.com/kcpe_english_answers_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e61a43b-5c61-4ea2-96b6-4d3e4dcb6e61/gagolomujotisok.pdfIn PDF document text
    • http://xofigawarogipiw.rf.gd/sapogimosefeletef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a69a0dc4-578e-4f16-bcb7-bf03f6041b3e/43946628624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec20deb4-1b49-43f3-b737-3da18fe45dcb/6488269371.pdfIn PDF document text
    • http://xolevusafo.myartsonline.com/73616994562.pdfIn PDF document text
    • http://pelubameta.epizy.com/boson_netsim_free_for_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a664e20-bbd2-4ce5-a8c3-37241a196c3f/negative_binomial_distribution_real_life_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87bc1cbf-8c8b-4446-ab85-d3a7031b1a97/antenna_and_wave_propagation_balanis.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 3612 bytes
SHA-256: 769e7e87b234279748867d14aeca67c34e917937181dde008dffe845a765253b
font_01_sfnt_off00010923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10923 5500 bytes
SHA-256: 0cab366797ca418581f1540b694fdab2f4274f727f4d02cfc9ba86b462630bbb
font_02_sfnt_off00011bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF7 11528 bytes
SHA-256: f519c7399628c93e5ebe6069e165b151c98a2b16ab653f5e7fe449caafacd8fb
font_03_sfnt_off00014284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14284 16060 bytes
SHA-256: d3ad76a86f89d2a735925e8256af04be175b64e5d048c40a7fe93ede6d66b9ce
font_04_sfnt_off0001571e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1571E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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