Malicious PDF — malware analysis report

Static analysis result for SHA-256 c571c8d88deca450…

MALICIOUS

PDF

67.6 KB Created: 2021-02-03 17:47:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 2689da4a5b55b4d4b206f01ac414c170 SHA-1: c5943e42ba23fe42ad7b1efb3249bd860928e70a SHA-256: c571c8d88deca450d88091f2ff183ccbf654edd701ca291793632915d9ca4f98
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://crophysi.ru/aws?utm_term=avengers+4+endgame+trailer+2++mp4 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4428045/normal_60183dfa2d1fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416504/normal_5ff9c37e2301b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466680/normal_600ce66cc3cef.pdfIn PDF document text
    • https://cdn.sqhk.co/rujosupatebu/idicvgg/used_motorcycles_for_sale_by_owner_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/kufezagivori/hfijuCw/remejunosafonez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392853/normal_6018b858bb7e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498882/normal_5fda062f1d376.pdfIn PDF document text
    • https://neveloso.weebly.com/uploads/1/3/1/4/131408616/kijosikix.pdfIn PDF document text
    • https://cdn.sqhk.co/worenora/iemSrij/nilavukozimawobosikopike.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459939/normal_5ff426dfecf89.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/bulujono/6113126883.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/changeling_the_lost_2nd_edition_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/brackets_punctuation_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/bus_travel_ticket_format_in_word.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/fawoworabivewenaxejotufaw.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/graphic_designer_portfolio_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/debupu.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/58766461020.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_off0000c9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CF 5548 bytes
SHA-256: 329dbf84f613c3774631a6764057d29dcc542a1d689a8a354bd69aa27cc433ec
font_01_sfnt_off0000dcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB6 10808 bytes
SHA-256: 922533e1aa8658d061977580dbb90daf37faa6bd7112f5dec670bb5f75d53824