Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f4d720dbc74656…

MALICIOUS

PDF

66.9 KB Created: 2021-02-21 20:10:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: c98edd22f2cf3c797811aa8a1a665d78 SHA-1: 7114d9f66b8fee4ad38e725f1153935d3a4e46b1 SHA-256: 09f4d720dbc7465689344fedb75c3ace57b2efc7b2fe6eb9549e95bc29583230
154 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier. It contains a link to a known malicious redirector, yafferge.ru, which is likely used to funnel victims to a phishing or malware distribution site. The PDF structure itself does not contain readable content, but the presence of embedded URLs and the critical redirector link strongly indicate a malicious intent to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/strik?utm_term=small+pumpkin+spice+iced+coffee+dunkin+donuts+calories In PDF document text
    • https://cdn.sqhk.co/xodakebebit/gsihyha/funny_videos_on_youtube_animals.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403537/normal_600e2439d4a6a.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/jgJiiah/48816851413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454665/normal_5fd7c1606f427.pdfIn PDF document text
    • https://cdn.sqhk.co/wujejelot/bcGFhbJ/screen_recorder_hd_screens_video.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496360/normal_5fce026616883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367911/normal_60176c5592ef3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447089/normal_5feb63aed672b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403534/normal_5fe40f9ca7981.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444386/normal_60011f1031b9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407304/normal_5fd65e55a5055.pdfIn PDF document text
    • https://cdn.sqhk.co/kosojilufut/ppliaau/crowdfunding_campaign_titles.pdfIn PDF document text
    • https://cdn.sqhk.co/simizekovogi/gdgjhgU/71005941080.pdfIn PDF document text
    • https://cdn.sqhk.co/lomotutuwe/dThbFIF/75969865800.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/jiwotarotavuz/digital_painting_photoshop_brushes.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/70672027646.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/22758034456.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_off0000c90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90C 5468 bytes
SHA-256: 0166ad77fa10b1dbce898064a7f7ff7087539bdd9b34e054aa78d540da2f2b2a
font_01_sfnt_off0000db8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8F 10172 bytes
SHA-256: ee96ba52c6dc4df28dad4f76d1c01eded0f9b539eac5242777b77c7eb9bb3580

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