Malicious PDF — malware analysis report

Static analysis result for SHA-256 1677d8aad75c6dfa…

MALICIOUS

PDF

93.6 KB Created: 2021-03-26 03:05:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9924f28cdf486a23b6f4ceca39fae434 SHA-1: 2c47933e22b6ec3948b97abf77babb7616e9d2e2 SHA-256: 1677d8aad75c6dfa255ba07618f9582f04dd5fd53c4e0312af774953addde7ed
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • 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://nipisod.ru/strik?utm_term=history+of+islam+in+africa PDF link annotation
    • https://tatudibew.weebly.com/uploads/1/3/0/8/130813899/sepuzelenixo_dagat_gujiwadaf.pdfIn PDF document text
    • https://pidofuvu.weebly.com/uploads/1/3/0/7/130739764/xokesoremo-ziludanoto.pdfIn PDF document text
    • http://bibasawodugo.22web.org/44184979532.pdfIn PDF document text
    • https://rizomoxus.weebly.com/uploads/1/3/4/5/134589692/306982.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/pay_slip_download.pdfIn PDF document text
    • https://katinena.weebly.com/uploads/1/3/1/3/131383377/xolitugetixiw.pdfIn PDF document text
    • https://sonujeti.weebly.com/uploads/1/3/0/9/130969686/1977483.pdfIn PDF document text
    • http://kiwikinixibiko.iblogger.org/android_studio_preferences_option.pdfIn PDF document text
    • http://liketime.fun/73860037205ofhu3.pdfIn PDF document text
    • http://1freedom.space/matematik_zml_soru_bankas_indirhlqk3.pdfIn PDF document text
    • http://soxetav.iblogger.org/when_did_urbanization_first_begin_in_human_history.pdfIn PDF document text
    • https://xuniwinasifobip.weebly.com/uploads/1/3/5/3/135302293/4021525.pdfIn PDF document text
    • http://reawolt.online/respironics_remstar_auto_m_series_a-flex_cpap_machinek6oee.pdfIn PDF document text
    • https://xabesokexiba.weebly.com/uploads/1/3/4/3/134327988/32a12410392f.pdfIn PDF document text
    • https://jevoweli.weebly.com/uploads/1/3/5/9/135958856/rozigatuv_tikudub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fubavinexazixo.onlinewebshop.net/geronimo_stilton_collection_books.pdfIn PDF document text
    • http://sijopar.epizy.com/31839953420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1e3b7bc-b69e-4577-9f00-1c48c9d56cb3/90669363398.pdfIn PDF document text
    • http://juzefabamurever.rf.gd/bottom_navigation_bar_android_xml.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9496f2b6-5309-4563-8439-5cb3b45d1e45/sharp_el-1197p_calculator_ribbon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7af30b0e-3bd7-4629-8cfc-67452ed03ea5/73118569565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a447bdc-94e3-4a7f-ba8e-71f8add0c935/gikedegukametodep.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7C 5092 bytes
SHA-256: 39b897822199503782eec199e115ea53885abac615194fb992de18c950d3fc36
font_01_sfnt_off000120c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C0 12048 bytes
SHA-256: beed9459501eab87e20e11b14ac0bb4d7c26ed9a618750a1d95b6bd29ce1b533
font_02_sfnt_off000147a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A8 19816 bytes
SHA-256: 9dc421be64dd9fb248204a1b91af9f6aa6e5b7a024cc174fb170da77382ca2e8