Malicious PDF — malware analysis report

Static analysis result for SHA-256 520823c3b2f11371…

MALICIOUS

PDF

74.0 KB Created: 2021-02-10 17:24:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: d6eea54c2c6ea4f90051a504389215ad SHA-1: 288c9d6e37921a4bbb8421f3ae0dfa4025626213 SHA-256: 520823c3b2f11371664cde586ed52309188e29d64db45fc03162ef50d2e2cd0e
244 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=heritage+grove+middle+school+supply+list In PDF document text
    • https://cdn.sqhk.co/tajixixejafi/hAihmid/feed_in_braid_salon_near_me.pdfIn PDF document text
    • https://maverutorolo.weebly.com/uploads/1/3/5/3/135393183/726ea.pdfIn PDF document text
    • https://cdn.sqhk.co/dakubakasilu/hfjeoib/soccer_star_killed_in_car_crash.pdfIn PDF document text
    • https://cdn.sqhk.co/juduxijumijo/07ijrhj/ares_virus_2.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/1N5AxGe/84176664926.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/kz0jjUd/tewipetalakepoxujexas.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/ojhP6tr/sovuwisanifomeburobe.pdfIn PDF document text
    • https://cdn.sqhk.co/mojerakikav/fgjhbNE/45177309577.pdfIn PDF document text
    • http://sifasawiseziwi.iblogger.org/lebopizofu.pdfIn PDF document text
    • https://cdn.sqhk.co/zewuxumaro/vijPifm/kevogobifujo.pdfIn PDF document text
    • https://balolenitazir.weebly.com/uploads/1/3/1/0/131071159/4570929.pdfIn PDF document text
    • http://detonic-deutschland.website/6702646643qb0gc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lilivuxaja.rf.gd/before_we_go_book.pdfIn PDF document text
    • http://vukigopi.rf.gd/88569229497.pdfIn PDF document text
    • http://gamemogap.epizy.com/angular_formcontrolname_nested_component.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_off0000e205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE205 5612 bytes
SHA-256: 5c154aa93e87d18c9838c1d91697f373bfbef5553feb28aced2615bea8c44a19
font_01_sfnt_off0000f4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 11168 bytes
SHA-256: 7d28936e2d2496e2f853dd62a54456c882e611b7ddb583f95de3768d594bc691

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