Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c7a7525dce1937…

MALICIOUS

PDF

68.7 KB Created: 2021-02-10 20:19:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 70c3d7b55aba6741a4f9f15d9f9a59ac SHA-1: 3194bf53d67e615a9c8860ed7fba91febf3c93bc SHA-256: 84c7a7525dce19370785e02a7471435f9578391c740715539ad64e140eae05b6
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/wb?keyword=aiff%20file%20format%20header In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388596/normal_6022a676289c5.pdfIn PDF document text
    • https://goginaderexikez.weebly.com/uploads/1/3/5/3/135306094/davuluxunug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381759/normal_5fd3025161abc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481528/normal_5fde5da1c45d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393489/normal_600f7321ea2cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470981/normal_60082ac8d864a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468838/normal_5ff0baf5f056d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453563/normal_5fd2eb93adaff.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/sazomo/72952109448.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/jogos_dos_transformers_autobot_stronghold_2.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/18657708429.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/62797521456.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/8321129101.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/beyblade_burst_mega_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/chess_board_wallpaper_ing.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_off0000d1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F8 4956 bytes
SHA-256: 8f523072f4b87671de03571a9e359759b1ad8d4f757509e60b1eee23ae0353b3
font_01_sfnt_off0000e2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A2 10516 bytes
SHA-256: c95c5a65dc36bf8c5bcf10d1c62257624cbc095010e2487ea24fdafb46678eb1

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