Malicious PDF — malware analysis report

Static analysis result for SHA-256 998f0f89fd25c28a…

MALICIOUS

PDF

82.5 KB Created: 2021-02-09 23:57:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c1e1debea96dc2e4b358d3f701c04f01 SHA-1: f537791785518b139f3fcae06a1688942c272418 SHA-256: 998f0f89fd25c28ae3b8917f8d125f4de40be779bb88536daeb7b821a2a97890
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious, suggesting it is a phishing or trojan attempt. The document body, though heavily obfuscated, contains text related to 'math algebra word problems pdf', likely a lure to entice users to click the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/wb?keyword=math%20algebra%20word%20problems%20pdf In PDF document text
    • http://whysmall.space/japanese_american_porns7wpm.pdfIn PDF document text
    • https://cdn.sqhk.co/zeliravepuj/iXYvNIh/3887347571.pdfIn PDF document text
    • http://mrshadow.net/vepufoferofoda35vjn.pdfIn PDF document text
    • http://stylecurtains.com/manual_de_farmacologia_basica_y_clinica_velazquez_descargar8b5dg.pdfIn PDF document text
    • https://cdn.sqhk.co/xobupiba/79hfGhe/magic_piano_tiles_2_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/4TuNRih/grow_credit_union_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/nuditufu/dnjjLhc/womodarezerejavagamapeli.pdfIn PDF document text
    • https://cdn.sqhk.co/kasesiseb/wM95ifL/indycar_race_results.pdfIn PDF document text
    • http://falutaburifa.iblogger.org/buyer_s_order_car.pdfIn PDF document text
    • http://draiwenstore.online/7356770918nwfle.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bezutu/80681356442.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/what_s_up_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/brian_tracy_maximum_achievement_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/9403726141.pdfIn PDF document text
    • http://dawifugoxumevej.rf.gd/telephone_billing_system_project_in_vb._net.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/basic_accounting_equation.pdfIn PDF document text
    • http://fatafebegit.epizy.com/app_cloner_premium_apk_cracked_free.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_off0000f122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 5692 bytes
SHA-256: 8256d25123ee39f7c9987b35ce03516fe7b35adc53d19b9ad2887dba8b0f4cf8
font_01_sfnt_off00010474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10474 10364 bytes
SHA-256: f73b58e83ffcf8b8fc8cbc0fe44cc783c4c3fce3277530aa8f7c7c90de470521
font_02_sfnt_off0001282a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282A 16060 bytes
SHA-256: b57f5103d5faf8d80bc74690144482ff00c8cc416c15fc5fdf6f6c03eb35bac5

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