Malicious PDF — malware analysis report

Static analysis result for SHA-256 31959b9ca2798ff3…

MALICIOUS

PDF

66.7 KB Created: 2020-11-18 12:20:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 90362531e2adcdcdc4d13f8a7e3e29e4 SHA-1: 15c8da5dd06f68e0aa7ed073dd9a48a187ebe097 SHA-256: 31959b9ca2798ff374ef95c71b1374c8b1ddc2f09c2282d6140ff4b172067343
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://ggtraff.ru/aws?utm_term=hungry+shark+mod+apk+3.+5.+0 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4450145/normal_5fb28628677f9.pdfIn PDF document text
    • https://kowawixuru.weebly.com/uploads/1/3/4/5/134509215/jixewizenogiv-fovifexonukoxin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5fab0679ed924.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a4dd68b-089c-4891-bba6-810b401d19ce/65172194357.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/81638729032.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8e7a6b8-da71-45df-8cb5-51e41f92081f/giriwebam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7545feef-ecb5-4841-8d57-5deb8f1360da/create_an_airline_slogan_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/lisidevosowelovatibesowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e3a82cc-a21c-4fe6-99f3-b8d559bedb50/idle_miner_hack_game_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/affordable_care_act_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57f8012d-3b1c-4b90-960f-2331007f26f0/volivemodafuderinogoruguk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faee29f7-94a3-4a9b-b017-162169186e2d/22750600290.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/57561529268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84819dca-986e-42c7-adab-d18d939d2403/980391021.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_off0000c72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72D 5932 bytes
SHA-256: fff9f3620ec6ae855350b99fcbc84ea19fc41b99bab3c0fa32f633735ce52a39
font_01_sfnt_off0000db4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4B 10360 bytes
SHA-256: 132c248a408d6352e2fbc864e80c9964e6d03840b9b479edeecb1a3191ede57e

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