Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9548b2748ae46ca…

MALICIOUS

PDF

77.2 KB Created: 2021-03-01 01:06:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 4072f48e65c66734749ecf7f7db3a7ee SHA-1: 5ca130ca18d6a8252a8054aed2e9755626cd1acc SHA-256: d9548b2748ae46cac5353b0a285d48ba03cfb8bc1f658ac71fc61ba465910a98
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links that redirect to disposable domains, suggesting a phishing or scam campaign. The presence of links to known malicious redirectors and a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=operations+research+analyst+job In PDF document text
    • http://vasupab.iblogger.org/how_can_i_make_it_right_with_god.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/90463699552.pdfIn PDF document text
    • http://defokozixeral.sportsontheweb.net/what_is_the_literature_review_section_of_a_research_paper.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/what_is_the_salary_of_a_certified_medical_assistant.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/radio_shack_getting_started_in_electronics.pdfIn PDF document text
    • http://desokore.medianewsonline.com/16513727700.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/86853796847.pdfIn PDF document text
    • http://rajukilodagoje.mygamesonline.org/lifetime_44_impact_adjustable_portable_basketball_hoop_instructions.pdfIn PDF document text
    • http://fuwenosod.iblogger.org/vietnam_visa_on_arrival_entry_exit_form.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/50811318262.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://lorenivi.rf.gd/48493179031.pdfIn PDF document text
    • http://repuvamiperubo.epizy.com/barreras_no_arancelarias_peru.pdfIn PDF document text
    • http://xodolipifonabo.epizy.com/math_calculator_plus_apk.pdfIn PDF document text
    • http://vibizif.epizy.com/64318814835.pdfIn PDF document text
    • http://kaloruligot.onlinewebshop.net/how_to_unlock_motorola_apx_6000.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_off0000e493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE493 5156 bytes
SHA-256: 17c32ec5fbfefac56bda83be67e9a4bbf1f51cbed13ad0a4766f9e396e08bead
font_01_sfnt_off0000f60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 10428 bytes
SHA-256: b8bf3035fcec1a84082ecf1af09c897260b7cbed7896a3901b881e09d6734276
font_02_sfnt_off00011988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11988 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361