Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f21816fccd39c61…

MALICIOUS

PDF

70.1 KB Created: 2020-11-09 20:36:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: cd3a25cebec9b9681a47b3764dcee304 SHA-1: 8dcfca95bdef3b82080b0f0992827251aacbf74f SHA-256: 8f21816fccd39c6188abecf1fdee71d2577d2b3c949a3fadd983576e44cc2c99
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/strik?keyword=eagles+gameday+live In PDF document text
    • https://nupejaxisolerez.weebly.com/uploads/1/3/4/3/134348845/bfec89d81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/bf734288-437b-45a3-b2af-35628e488046/xiwaduvuvamenatijobadok.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/36189193147.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/literacy_strategies_for_improving_mathematics_instruction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/335ff0fd-9b48-403e-be16-10b7d5ccf3d8/ajari_aku_cinta.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/2019_zx6r_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d45226b-df5f-4356-886e-f44beca8c19f/tilil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/463cfeef-e455-4718-9121-b75d16ad8c48/logo_quiz_level_16_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/98489025917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d77e135a-4112-4ed0-8140-ef1e21e39e33/go_math_5th_grade_lesson_6.1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/wivuzuz.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/how_to_make_a_whistle_out_of_bamboo.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/tozovaxadala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7550e6e0-e690-442f-a171-a6905e5f3189/75623205134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5666531-7ff3-4d56-b278-955eb0410bba/86134415609.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD6 4660 bytes
SHA-256: daf46f20f19e497a69826b5fdee6bc2f0b2f08853bb5164fd6d460be3e350e40
font_01_sfnt_off0000dbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAF 9856 bytes
SHA-256: 17033c1419be8c1014851c9edfdb62351129491667f0083c29381322e20d8a44
font_02_sfnt_off0000fd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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