Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b156321606d6de…

MALICIOUS

PDF

85.5 KB Created: 2021-03-20 04:12:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 23c9013e215571063c4295b8ac81e63a SHA-1: c7118614b8420d935f3eb7b8cb9ac98aad47a67e SHA-256: 42b156321606d6de387c3121b6c0ec0ed9ab9eb92ce1764360d7533b4b163530
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely using embedded JavaScript to facilitate redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • 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 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://xajibur.ru/strik?utm_term=dead+and+gone+ti+ft+justin+timberlake+lyrics PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458854/normal_602a07fe8174f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467564/normal_6015803961bda.pdfIn PDF document text
    • http://pevazaw.mypressonline.com/luvekerapijumalosoxomijew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_5fdaca429944a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470960/normal_5fdefc72ba711.pdfIn PDF document text
    • http://pobesegu.scienceontheweb.net/dopebokinaximuwejiv.pdfIn PDF document text
    • http://nobelopagix.22web.org/tebije.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462038/normal_5fea3f4c6015e.pdfIn PDF document text
    • http://tusiteguluvora.getenjoyment.net/fupanik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481676/normal_601cbb4e8f7f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370092/normal_5fd6eeb59886d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5fd15f2b83987.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450512/normal_5fcc14631e0c7.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://pixelub.rf.gd/nozaliwokojivibi.pdfIn PDF document text
    • http://wuliwopiveti.rf.gd/wukibimi.pdfIn PDF document text
    • http://bolilolu.epizy.com/jisoxek.pdfIn PDF document text
    • http://vemexomejolu.epizy.com/lonely_planet_book_of_everything.pdfIn PDF document text
    • http://boxemoje.epizy.com/best_med_school_personal_statement.pdfIn PDF document text
    • http://dowafirowelumex.atwebpages.com/how_do_you_set_the_time_on_a_citizen_eco_drive_radio_controlled_watch.pdfIn PDF document text
    • http://rekekolulopar.rf.gd/bohemian_rhapsody_trumpet_quartet_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/masopivizawofinamibiz.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/34343212636.pdfIn PDF document text
    • http://mulexotuvatago.epizy.com/fisiopatologia_del_asma_2017.pdfIn PDF document text
    • http://rawarawoxegig.epizy.com/the_theory_of_continental_drift.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/zonisizivoja.pdfIn PDF document text
    • http://pojotew.epizy.com/grade_3_reading_comprehension_worksheets.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_off00010082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10082 5604 bytes
SHA-256: b472eb3684e7132e8392878afc7b49eff343566d0d34be45ef3e633f1b1a7853
font_01_sfnt_off0001138f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138F 11088 bytes
SHA-256: 62904b31c8dd4c8c07f9a08aaa57f55916844ec3e72cfef31d60c0bfa3823f9f
font_02_sfnt_off0001394f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c