Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4ef7a7942f939c…

MALICIOUS

PDF

73.0 KB Created: 2021-02-04 20:17:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a041d199bec3c4573f7bf276048216ab SHA-1: a26d2ce406f4aefcd1548b4d289c59d41073956e SHA-256: 2d4ef7a7942f939c558b9d6a1110c754774102fd59fd8cfbbc76bb7523eb4d86
174 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for a malicious redirector link, pointing to 'https://yafferge.ru/wb?keyword=custom%20action%20bar%20android%20github'. This URL is likely used to redirect the user to a malicious site. The ML classifier also flagged this PDF with a high probability of being malicious. No scripts were extracted, but the presence of a malicious URL strongly suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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/wb?keyword=custom%20action%20bar%20android%20github In PDF document text
    • https://static.s123-cdn-static.com/uploads/4385198/normal_5fc6033c5627e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445341/normal_5fec7e9126585.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375093/normal_5fe41c6bb79c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455377/normal_5fd04135c8ee5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5fda96ee07f13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481699/normal_600804c715c51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418368/normal_5fcda63a54c51.pdfIn PDF document text
    • http://walletelectrum.buzz/bloons_td_5_monkey_lane_impoppable_guide95nik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465007/normal_5fe9d9a0350c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467950/normal_5fe18a36accea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466161/normal_600406db25ab0.pdfIn PDF document text
    • http://instapriz24.site/stroker_zuzu_juegos_similares0z91n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406775/normal_60105626d332b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487647/normal_5fed01e60f69e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476436/normal_5fd2d7f6ebe2c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000de2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2B 5368 bytes
SHA-256: 90997617ba614b642a959805e32676f1c2f91854bf2f2215fd6c2ad8caf360be
font_01_sfnt_off0000f033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 11584 bytes
SHA-256: b3e821df7e6d2032f2b44303fb691cdf1d17a9e8495c93f4de16e81516003ff7

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