Malicious PDF — malware analysis report

Static analysis result for SHA-256 920f7136a58037b8…

MALICIOUS

PDF

72.4 KB Created: 2021-02-14 06:26:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 3c9a94845f3a28129288eba7296b1ac8 SHA-1: ec7b78be66bf23517c34db48e0df6c68b1060410 SHA-256: 920f7136a58037b8788fa662f8e72218dde62a0e5a8ee15f682f99ca15e95907
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=goodbye+to+all+that+pdf+joan+didion In PDF document text
    • https://static.s123-cdn-static.com/uploads/4446147/normal_6004d16e243dd.pdfIn PDF document text
    • https://tixuxajus.weebly.com/uploads/1/3/2/6/132682254/ruvabanov-savupozofoti-doviw.pdfIn PDF document text
    • https://volokosebu.weebly.com/uploads/1/3/4/8/134871595/2085128.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467007/normal_6002b23d7bfb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403560/normal_601a7eceeda25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413865/normal_6000b35d26a1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485001/normal_600d51fda6ecb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475559/normal_60265768eaf69.pdfIn PDF document text
    • https://pegepujime.weebly.com/uploads/1/3/1/4/131453637/lumugusujosere.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/nuselufuzo/86686790911.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/malewewizimixaxesiso.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/fikigoxukegezofadazu.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/air_conditioner_types.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/char_broil_performance_series_4_burner_grill.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_off0000e011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE011 5204 bytes
SHA-256: be6e90c19d48a4dfc70a0ee8778a35402e7ce19cc2584e794858c9d71b203468
font_01_sfnt_off0000f1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CF 10148 bytes
SHA-256: ca54bdc3ff971774109c7439a4f38e1e391ccf5c5c167e870df97c901b3504ce

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