Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f37f68054176396…

MALICIOUS

PDF

81.3 KB Created: 2021-04-06 12:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 59fcd781e2d60c9f5f33b82d38488db1 SHA-1: 6c45d68401df51717e929a74b97857b37fa05cc3 SHA-256: 8f37f68054176396f8faa7c7ab9789b48fb5d9f1d08b6aad91e993e104b3ac03
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting or redirector infrastructure, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://yafferge.ru/award?keyword=antagonistas+de+la+aldosterona+mecanismo+de+accion+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4457570/normal_5fc932858f303.pdfIn PDF document text
    • https://penizamuravepu.weebly.com/uploads/1/3/5/9/135976181/folabetowekisoma.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454973/normal_5fcb4979ca33f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489255/normal_60021006a1833.pdfIn PDF document text
    • https://fimozafovobas.weebly.com/uploads/1/3/2/7/132741130/sowokizopuxusek_jotur_kolibobobitivi.pdfIn PDF document text
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/kodawuwa.pdfIn PDF document text
    • https://fudolimag.weebly.com/uploads/1/3/4/5/134586879/d493df4546eea91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450864/normal_6017003e44e20.pdfIn PDF document text
    • https://samituvejasuw.weebly.com/uploads/1/3/1/4/131406365/7137357.pdfIn PDF document text
    • https://funogefoxareso.weebly.com/uploads/1/3/4/0/134041001/ruvidazu.pdfIn PDF document text
    • https://modibabujoxasa.weebly.com/uploads/1/3/4/6/134694511/pisef_vumewivegom_dulironavefamup_tazuwiralijiru.pdfIn PDF document text
    • http://laxuribotu.iblogger.org/what_to_do_if_your_judge_is_biased.pdfIn PDF document text
    • https://wunabigoji.weebly.com/uploads/1/3/4/8/134891590/99612.pdfIn PDF document text
    • https://kewojifusufiw.weebly.com/uploads/1/3/4/6/134662328/ripes.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/lezerawe/hallelujah_chorus_piano_solo.pdfIn PDF document text
    • http://dipijiz.epizy.com/gijabigeleva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b25f5f6-913e-4303-acba-3f31e94c03fa/92795370754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89b66ccd-0792-4245-b138-9cbf448b14ce/boy_scout_fieldbook.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/plant_dna_extraction_lab_report_discussion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30cc281f-8b07-4eed-9a33-5bece14d7da3/14135706639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/560ef2d9-cec5-4501-b747-2f569837021b/english_tenses_exercises_pre-intermediate.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/report_student_arrive_late_to_school.pdfIn PDF document text
    • http://luzirilokupozar.rf.gd/algoritmo_de_dios_cubo_rubik.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/fanilufimudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37ac1675-278d-47e2-9b11-976d7148bf74/xejisexu.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/mental_ability_test_for_upsc.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_off0000fb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 5464 bytes
SHA-256: a384536ba1ce2c8a9e2dbdca25302bcc8d30cf4afa277899420b7507598feb2e
font_01_sfnt_off00010da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA6 12248 bytes
SHA-256: ceea1b82e59bf2cd1afe836b9e4dc83dc2d3003f86a52526ea17d8eb0b90f3d3

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