Malicious PDF — malware analysis report

Static analysis result for SHA-256 6050cd97055c06f2…

MALICIOUS

PDF

72.0 KB Created: 2021-01-27 15:41:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 28a2a7a276f7f98cf5d9163267b3ed41 SHA-1: 925c84b81e47cfa3d94d5a15da4299455b0daaae SHA-256: 6050cd97055c06f2bf56999b56fd631b72dcb3807b5071b795e251b80f9f5dce
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs that lead to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to educational materials ('vague pronouns worksheet 6th grade answer key'). The ML classifier and ClamAV detection strongly support the malicious verdict.

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://yafferge.ru/123?utm_term=vague+pronouns+worksheet+6th+grade+answer+key In PDF document text
    • http://superheatbelt.xyz/drag_racing_boats_for_saleb4fyy.pdfIn PDF document text
    • https://cdn.sqhk.co/filomada/kif1nhj/nukukunanikipak.pdfIn PDF document text
    • http://leyloften.online/dojamatejhkygx.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/gcXoggw/1733463586.pdfIn PDF document text
    • http://mamajan.space/birthday_cake_images_name_iqraq2394.pdfIn PDF document text
    • http://barashik.space/transfer_case_fluid_colorb0r48.pdfIn PDF document text
    • https://cdn.sqhk.co/xadowififux/djhjiij/sebimoziwivipovadefolaji.pdfIn PDF document text
    • http://scrlt.xyz/family_farm_seaside_cheat_apkit2th.pdfIn PDF document text
    • http://helpcenterbusiness.xyz/36173638423wmhi0.pdfIn PDF document text
    • https://cdn.sqhk.co/zejegure/cDfghja/health_wellness_health_newsletter_examples.pdfIn PDF document text
    • http://deemonatrafik.xyz/nesafisejases2e211.pdfIn PDF document text
    • https://cdn.sqhk.co/mekizojo/biIheic/fortune_global_business_news_analysis.pdfIn PDF document text
    • http://relax35.ru/romukotivoxiwirixexod9efy.pdfIn PDF document text
    • https://cdn.sqhk.co/nunewole/hbrIwie/the_sims_tm_mobile_download.pdfIn PDF document text
    • http://klokisik.space/spina_bifida_types_meningoceleqxmwn.pdfIn PDF document text
    • https://cdn.sqhk.co/sazalevimit/hc0ihrV/.pdfIn PDF document text
    • http://probkin34.xyz/sisinajomadjt7n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tinejamuwaki.epizy.com/ccna_3_chapter_6_exam_answers_v6.pdfIn PDF document text
    • http://gisesufuxezemud.epizy.com/android_refresh_adapter_recyclerview.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_off0000db65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB65 5564 bytes
SHA-256: 0640120f3d52e8401919808082e728ae462e9dcd37b58839bfaf8d49eeb5fb9e
font_01_sfnt_off0000ee6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 10624 bytes
SHA-256: c7130a9af52d10a52305c8cef3bc40068a6664c05442030dad7f0325f7b0fac1

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