Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8df240dbb8c2a5…

MALICIOUS

PDF

82.0 KB Created: 2021-03-30 10:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4cb04a9b707b3358ac4712be8a01c066 SHA-1: 0d5c37d9e49ead389a34714eff4bd8d4fabce07d SHA-256: df8df240dbb8c2a53430c8dbe7f157dd09682f625ce2598828c0af675c4895eb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a site related to 'hackers toefl actual test reading pdf', suggesting a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing attempt, likely using social engineering to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://jacksth.ru/award?keyword=hackers+toefl+actual+test+reading+pdf PDF link annotation
    • http://duwudivusupo.mygamesonline.org/days_of_the_week_in_arabic.pdfIn PDF document text
    • http://xelasurugopu.mywebcommunity.org/engineering_workshop_materials_list.pdfIn PDF document text
    • http://kaxiwemusemoj.mypressonline.com/reading_comprehension_book_grade_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462374/normal_601cb34233d21.pdfIn PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/hhhgj7A/call_of_mini_zombies_2_hack_2019.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/63925351341.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_60418ef296380.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/lgdp5ig/liligiroxafij.pdfIn PDF document text
    • http://juponuziwotaga.mywebcommunity.org/lc_oscillator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368224/normal_602426742c4ab.pdfIn PDF document text
    • https://cdn.sqhk.co/zafupusapun/ghjfDm7/bolawirezixabanajememiv.pdfIn PDF document text
    • http://rixanemusijod.mywebcommunity.org/blowguns_the_breath_of_death.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/Uhigjgc/equalizer_2000_imdb.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/mEgeVlF/chain_react_pro_apk.pdfIn PDF document text
    • http://zexitekaxob.mypressonline.com/republic_day_awards_2020.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://dusameferadulo.onlinewebshop.net/31392878710.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/attitude_shayari_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/ximowule.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/samowafege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ff124f6-bbc4-41ba-971e-170be9b6f951/how_to_single_crochet_left_handed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56de69fb-6e2a-4d69-a8a0-112c6e66622a/dirk_gentlys_holistic_detective_agency_streaming_ita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19c6e14c-6803-4ef2-b16f-9b739385d18d/26548893068.pdfIn PDF document text
    • http://fabevax.myartsonline.com/63051174724.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfdb0d00-2d0b-444f-bcfb-2fdab85ccca8/what_causes_static_on_my_landline_phone.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE60 7548 bytes
SHA-256: 30701ee0f05dff9d7d52a94321278fa5ad0bcc2c8d59f69ae363ce018033c557
font_01_sfnt_off0000f758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF758 5228 bytes
SHA-256: 128ca2af082ff321d940439b260c1dd26cfd8d5e08a32d402da5c3d40693e9da
font_02_sfnt_off00010928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10928 10272 bytes
SHA-256: 809c76dd05c7bd37970fc103a68b2d4fd0d382b7dd1e9a6c35282f55fc158932
font_03_sfnt_off00012bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176