Malicious PDF — malware analysis report

Static analysis result for SHA-256 d799169b85a470a3…

MALICIOUS

PDF

79.3 KB Created: 2021-04-06 00:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 83443889b8891c6a302d02dbf08cb6a4 SHA-1: 44c4be46d3bca13666ef8fcfe7c068d007987b4b SHA-256: d799169b85a470a3948fd07da8b709a378deeab0cd7c65ac2939dbecbf391242
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/award?keyword=building+materials+and+construction+practices+pdf PDF link annotation
    • http://blu-ital.space/the_one_thing_inxs_chords4pax3.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/horizontal_and_vertical_asymptotes_worksheet.pdfIn PDF document text
    • http://stroymarketmetal.ru/what_should_a_graphic_designer_resume_look_like61j0o.pdfIn PDF document text
    • http://fajamad.mypressonline.com/barron_s_essential_words_for_the_gre_latest_edition.pdfIn PDF document text
    • http://kigumelez.medianewsonline.com/converter_em_word_i_love.pdfIn PDF document text
    • http://ductsunlimitedins.com/2018_monthly_calendar_template_google_sheetsjabkg.pdfIn PDF document text
    • http://hayatevesigar.online/gdp_and_per_capita_income_of_indiarvnl0.pdfIn PDF document text
    • http://bijopesenof.iblogger.org/how_a_good_man_treats_a_woman.pdfIn PDF document text
    • https://korenumotijele.weebly.com/uploads/1/3/4/6/134687452/puwilibuxefot.pdfIn PDF document text
    • https://polepufexiri.weebly.com/uploads/1/3/1/3/131379743/gixika.pdfIn PDF document text
    • http://mstmail.space/88249403656n6mrr.pdfIn PDF document text
    • http://kesisofawa.mygamesonline.org/agatha_christie_and_then_there_were_none_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wenibeliso.atwebpages.com/access_point_toronto_application.pdfIn PDF document text
    • http://xawiwevivuzox.onlinewebshop.net/8218220143.pdfIn PDF document text
    • http://jomedive.epizy.com/lemopibosub.pdfIn PDF document text
    • https://2c0370cf-43ec-4dc9-8589-ec1e7793a70d.filesusr.com/ugd/404058_49e832a36e3d45bbbbe823fb090a81c1.pdf?index=trueIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_35495e70dae54e71a645820633ec65c9.pdf?index=trueIn PDF document text
    • http://teporududa.rf.gd/asme_y14_5m_2020_tolerance_chart.pdfIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_9a22bbea9f344c4291c7b45ed528f1d6.pdf?index=trueIn 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_off0000f631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF631 5524 bytes
SHA-256: b4eafde5f151eb3f7ec707ce241deae46a1c510d716bda82bc2031df2a9b1159
font_01_sfnt_off000108e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E7 10780 bytes
SHA-256: b8e41c479f9564ab455db36bfbdd7670b589585fcb9a08a8c079ef7aa94bcaa5

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