Malicious PDF — malware analysis report

Static analysis result for SHA-256 257ed7216cea5c00…

MALICIOUS

PDF

71.2 KB Created: 2021-02-06 10:44:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 91b379855169a104f02cadf842cc0162 SHA-1: 92b2b4fac2fd93c44bcb7ce006b9d7a365241e89 SHA-256: 257ed7216cea5c00e3abe3007175715e092e3c1cc9ed34b074a101e6b3fcf346
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/wb?keyword=cara%20%20mod%20gta%205%20di%20ps3 In PDF document text
    • https://wunepilupizuxo.weebly.com/uploads/1/3/1/8/131857535/1913faf6.pdfIn PDF document text
    • https://cdn.sqhk.co/miraroki/gf3nhjW/ducks_in_a_row_squirrels_everywhere.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419818/normal_6016b9b75974f.pdfIn PDF document text
    • https://nikigetevakawu.weebly.com/uploads/1/3/1/4/131413362/07cfc9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458144/normal_5fdec5c8ce7ab.pdfIn PDF document text
    • https://dezazobe.weebly.com/uploads/1/3/4/7/134755526/5863e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417527/normal_5fc597c41725a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463810/normal_6019ba00212e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495402/normal_5fd6ce5250882.pdfIn PDF document text
    • https://titugujogimob.weebly.com/uploads/1/3/4/0/134017720/838c1c8984dd2.pdfIn PDF document text
    • https://cdn.sqhk.co/turaxulefa/aqbezif/penejaburaranapuninisote.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/woxorojero/wenepaxezad.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/free_net_tv_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/79634049159.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/lamination_sheet_shop_near_me.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_off0000d9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BB 5440 bytes
SHA-256: b536017318580c77b94f9c12844e348dd8aba61283a6c5c4118e85bccbc8a686
font_01_sfnt_off0000ec23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC23 10560 bytes
SHA-256: 5d3a76320abf4e46ee4eb9f41f0c3cd9cab51e9b659906842f1b50f71d6f9277