Malicious PDF — malware analysis report

Static analysis result for SHA-256 751cd865b1977c39…

MALICIOUS

PDF

67.9 KB Created: 2021-02-20 10:48:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 3c8d4432532e79a963ee248037fb2f0f SHA-1: 4d15dc920165726e7edd6ee97a3ddb8e8810caa8 SHA-256: 751cd865b1977c3914ee5d4c59a312826c8ba535eca5cf87cfae3b9f9ac09b61
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wix?keyword=sniper+3d+apk+real In PDF document text
    • https://gopoxigubujazu.weebly.com/uploads/1/3/0/9/130969754/435dfcb62d.pdfIn PDF document text
    • https://zajuzuvo.weebly.com/uploads/1/3/4/4/134474050/3057246.pdfIn PDF document text
    • https://cdn.sqhk.co/wewotiwalote/igjbzta/66252554526.pdfIn PDF document text
    • https://zokejiwiperasuk.weebly.com/uploads/1/3/4/6/134668939/zakokot_sugavanad_xubojuw_kekujug.pdfIn PDF document text
    • https://lejawoxaniw.weebly.com/uploads/1/3/0/7/130738778/1206216.pdfIn PDF document text
    • https://terodovob.weebly.com/uploads/1/3/0/7/130776228/xezaliruxorej.pdfIn PDF document text
    • https://tapebosipufadiz.weebly.com/uploads/1/3/4/3/134366988/tepogipajar.pdfIn PDF document text
    • https://sajozigita.weebly.com/uploads/1/3/0/8/130814351/97772.pdfIn PDF document text
    • http://sabukapu.22web.org/8598815599.pdfIn PDF document text
    • https://zuvitapud.weebly.com/uploads/1/3/1/4/131406427/zepadap.pdfIn PDF document text
    • https://cdn.sqhk.co/tegiriwepaj/fUjeBjg/farm_bill_2020_explained_in_marathi.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/xovajukoxin/microsoft_office_2010_activation_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/jutabawuxivupabibulumig.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/84710410885.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/avidemux_manual_espaol.pdfIn PDF document text
    • http://dojopugoput.epizy.com/halloween_bean_bag_toss_templates.pdfIn PDF document text
    • http://woniwasazox.epizy.com/82250832639.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/icloud_mail_server_android.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_off0000cd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD94 5104 bytes
SHA-256: eb6e38d8a108c0d4156fbf65623e55bf7f61560400120f19adcb83d29b0415b0
font_01_sfnt_off0000df04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF04 10536 bytes
SHA-256: bb5fa33c916dfb84187eeb8e492df065f6fda071c6fc8ed243d609b650ecaf00

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