Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35410f640e6f675…

MALICIOUS

PDF

69.4 KB Created: 2021-04-07 02:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a8e241962c9684ca49ee520375ff8a94 SHA-1: 5eca065a088661f8b9910e9cf1ed22e2f4c057eb SHA-256: e35410f640e6f675023c5f651e3c2a99acf8b94cdac7b68a8dab5b0b7c7eb7a5
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are flagged as malicious or part of a link farm. The document body, though heavily obfuscated, contains text related to 'Kronos 8.0 manual' and the authoring application, suggesting a lure to a malicious site. The presence of embedded URLs and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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://crophysi.ru/wix?keyword=kronos+8.0+manual In PDF document text
    • http://ledy66.net/does_tengo_have_an_accent_markvws5t.pdfIn PDF document text
    • https://jowuxedajaris.weebly.com/uploads/1/3/4/7/134716551/fibog-zijaf.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/mastering_the_art_of_french_cooking_volume_2_recipes.pdfIn PDF document text
    • https://jazexupojofon.weebly.com/uploads/1/3/1/4/131409098/wexepuxegaj.pdfIn PDF document text
    • https://babulavired.weebly.com/uploads/1/3/0/7/130775389/ab561fe82ba5b.pdfIn PDF document text
    • https://cdn.sqhk.co/gidulikegel/oniiqid/danuwukimegimabi.pdfIn PDF document text
    • http://nenonazuf.scienceontheweb.net/uppababy_mesa_car_seat_strap_covers.pdfIn PDF document text
    • https://guwosifewutus.weebly.com/uploads/1/3/4/6/134616196/jesijojijufev.pdfIn PDF document text
    • https://rafutukeri.weebly.com/uploads/1/3/1/4/131453201/fufujibetixa_ligib_tenavone_dugor.pdfIn PDF document text
    • http://degunoneb.iblogger.org/covid_guidelines_for_flying.pdfIn PDF document text
    • https://tifozofazok.weebly.com/uploads/1/3/1/3/131383738/1686316.pdfIn PDF document text
    • https://sonujeti.weebly.com/uploads/1/3/0/9/130969686/7803a3cc7f62354.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunudixa/qGhhQjg/55176804453.pdfIn PDF document text
    • https://fakilopatezi.weebly.com/uploads/1/3/1/6/131606638/xowuriguzedajideta.pdfIn PDF document text
    • https://dozowogan.weebly.com/uploads/1/3/4/0/134098910/1616684.pdfIn PDF document text
    • http://all-host.site/where_i_can_donate_used_clothes_near_mec4yps.pdfIn PDF document text
    • https://lobarogilipewu.weebly.com/uploads/1/3/4/4/134462863/tibav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://porilebunenagu.rf.gd/51144795161.pdfIn PDF document text
    • http://muxekatuwig.epizy.com/effective_math_teaching_strategies.pdfIn PDF document text
    • http://xenirizuxulol.rf.gd/mechanical_engineering_technician_salary_ontario.pdfIn PDF document text
    • http://nogekaz.epizy.com/kn_m3_to_pounds_ft3.pdfIn PDF document text
    • http://xakagigoneliv.myartsonline.com/math_grade_5_worksheets.pdfIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/thinking_in_java_download_4th_edition.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_off0000d407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD407 5168 bytes
SHA-256: 8719d776c515e49fd23121132612b8577045df761c60514a008c03ffd1253ab3
font_01_sfnt_off0000e582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE582 9788 bytes
SHA-256: c321e8075f1dc581f11965e954cb06e281c071a2253873a4b6c4a36c98c64b76