Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af91970d1be4c70…

MALICIOUS

PDF

72.4 KB Created: 2021-01-25 14:49:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 8049576641ea7ea8031e4cbb0d2145c9 SHA-1: 173b55e5b5bea1f1e246c52b5dabc33a103d995c SHA-256: 8af91970d1be4c707a15970d9155b8d0bca4a78b5627a66abe81e8bfd529619b
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=checkbook+numbers+template In PDF document text
    • http://216tilford.com/crowdfunding_websites_for_startupsn7kn6.pdfIn PDF document text
    • http://zdorovienashevse.xyz/senate_election_results_election2020bk9gn.pdfIn PDF document text
    • http://ruwegekugite.22web.org/akshay_kumar_housefull_movie.pdfIn PDF document text
    • http://titanovyi-filtr.ru/rarezebipafopupidfshb.pdfIn PDF document text
    • https://vanewuzopawibo.weebly.com/uploads/1/3/0/8/130814706/guguzu_mevipe_mijuvinofiris.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://widafasamuj.epizy.com/camera_xiaomi_redmi_note_7_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/82217788246.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/69313209494.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/1605586002.pdfIn PDF document text
    • http://nividibewejoba.rf.gd/37633718576.pdfIn PDF document text
    • http://kavejanunar.epizy.com/mathematical_modeling_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/spreadsheet_to_calculate_amortization_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/wemofodi/57970603613.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/30380291329.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/nesanisif.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_off0000dd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 5280 bytes
SHA-256: e6e9bcaafb456064854b440964f44a5671ef43d1d00d32c41172cded11bb439f
font_01_sfnt_off0000eebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBB 11176 bytes
SHA-256: bb1c52959702d782481a90d9edc2ac1434e3e6d4b289949f6a5c854f78534a7e