Malicious PDF — malware analysis report

Static analysis result for SHA-256 1695fbfb0e44abc3…

MALICIOUS

PDF

75.3 KB Created: 2021-04-15 12:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 70f437b2e93bafdbf3c4a79c19479f17 SHA-1: b49281f982afa51e1f3f5031c90b4f7319151801 SHA-256: 1695fbfb0e44abc31aec2aada4fb05637041fca13dbf54f0af3257ea5f54ce0f
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'exam questions and answers'. The presence of numerous links on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=ic38+exam+questions+and+answers+pdf+free+download+in+hindi In PDF document text
    • http://tafuxasomup.getenjoyment.net/albert_speer_biography.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387240/normal_600db7ef1c15b.pdfIn PDF document text
    • https://wunobenera.weebly.com/uploads/1/3/4/8/134887230/78d6c2260bb9.pdfIn PDF document text
    • https://zilakakazaxo.weebly.com/uploads/1/3/4/4/134442972/gajobupodirokatusiw.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/foretoxafalikibip.pdfIn PDF document text
    • http://teksol.xyz/838232691319k8ar.pdfIn PDF document text
    • http://chelamela.org/xovojubabuxelapifibodg0al0.pdfIn PDF document text
    • http://oneitstore.info/hitachi_10_compound_miter_saw_partsg49ge.pdfIn PDF document text
    • http://wujaxeniju.22web.org/92932879066.pdfIn PDF document text
    • http://nout-sale.site/wooden_surfboard_plansik88g.pdfIn PDF document text
    • https://gubelowilesatu.weebly.com/uploads/1/3/0/7/130739845/40d644213d3e.pdfIn PDF document text
    • https://mokowevabib.weebly.com/uploads/1/3/0/7/130739664/bukiluvasugeresu.pdfIn PDF document text
    • https://vejuvofarazaxar.weebly.com/uploads/1/3/4/3/134355137/givamul_gadigixodabusim.pdfIn PDF document text
    • http://wobufiparezir.medianewsonline.com/bank_po_english_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379842/normal_6013cd6339a80.pdfIn PDF document text
    • http://idealslim-italiaofficial.site/8163703386875tg7.pdfIn PDF document text
    • http://xuxikurov.mygamesonline.org/arthritis_back_exercises.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469374/normal_605f81972909f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424361/normal_5febb810d5a2d.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://difadedox.rf.gd/medical_lab_tests_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/201f998c-ce73-45f2-aedd-2cbf8955024e/les_misrables_movie_2012_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6697b3b-9c6d-4009-abf2-dbe1a32bf90d/how_to_listen_to_music_while_running_iphone.pdfIn PDF document text
    • http://zaxigadanu.rf.gd/head_on_collision_activity_3_answers.pdfIn PDF document text
    • http://xidatozekef.epizy.com/arpegios_para_guitarra_clasica.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_off0000d7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AF 5860 bytes
SHA-256: cd704147d1321f722318cc90360cee867c0c460001669c5962e6f123b38c5169
font_01_sfnt_off0000eb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB72 10420 bytes
SHA-256: 8e222b7ecbafd7b28fb7eab9c0fa051efd769e6dfdad91217473644116c5c444
font_02_sfnt_off00010eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EED 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378