Malicious PDF — malware analysis report

Static analysis result for SHA-256 245ec6dc56d8c1e1…

MALICIOUS

PDF

77.6 KB Created: 2021-02-06 20:17:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: a29a5c79f9f5d3bcd696756d85c36823 SHA-1: d653b0593297f6afcd2f9540ef8be06c486c4f5f SHA-256: 245ec6dc56d8c1e1aa69e77fe771b090cd86a83c84d22d4e89cb57bf0f7bfc7b
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://yafferge.ru/aws?utm_term=informer+movie+2008 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4445125/normal_5ff589bed8ddc.pdfIn PDF document text
    • https://gapojusegora.weebly.com/uploads/1/3/1/4/131408170/68542159.pdfIn PDF document text
    • http://prizinsta24.online/latest_software_for_iphone_6_pluskl5c2.pdfIn PDF document text
    • https://cdn.sqhk.co/kokowoxiwi/R5gvUYy/51435671109.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481289/normal_601a3ae287be9.pdfIn PDF document text
    • https://cdn.sqhk.co/renapudovi/gdjgxhc/edm_dancing_magic_beat.pdfIn PDF document text
    • https://cdn.sqhk.co/luwiwaduna/dADhhif/wifi_smart_switch_no_neutral_wire_required.pdfIn PDF document text
    • https://cdn.sqhk.co/joduragenep/ggdN8A3/2480217527.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530323/normal_5fc832f9e8211.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498983/normal_5fc61da7e094c.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/9zXed5m/fun_helicopter_game_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454182/normal_600a11eff38e2.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/4830391.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386607/normal_5ff50cc137d6d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jiwenufaxo.epizy.com/factorizar_trinomio_cuadrado_perfecto.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_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 4956 bytes
SHA-256: ba0ae469adace335024cf19f7f9f95a8622bad1626e8cd341cbb5f6bd9fb503d
font_01_sfnt_off0001031a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031A 11628 bytes
SHA-256: 47e4eff189415058bd6c092564f29b2cdc5730e552359eb6004009d5425385db

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