Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b71003b7f2e940…

MALICIOUS

PDF

70.0 KB Created: 2021-02-23 14:47:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: c0dbc326761421cac1381d3228cd8e21 SHA-1: 49c1a743f6284614056be8cb9d81d51acf428bc9 SHA-256: 41b71003b7f2e9402b645594286173081e2cea4839a69af7881ed5156741b090
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=we%2527ll+always+have+summer+book+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4374682/normal_5ff95dff86290.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443342/normal_5fcbd40be965f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485152/normal_5fe40b714cf6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487622/normal_602b875c9f76d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5fe8f8db2e900.pdfIn PDF document text
    • http://zirosax.iblogger.org/cellular_respiration_label_the_diagram_answer_key.pdfIn PDF document text
    • http://dnepr24.info/geek_auto_parts.comlr4xb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386354/normal_602091dbe8d54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477913/normal_5fd84eda3671d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476432/normal_5fffbc0252569.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401559/normal_5ff19259c41ae.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/jobavo/42139357161.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/22096979752.pdfIn PDF document text
    • http://sowezenuvafe.epizy.com/vufugogaxux.pdfIn PDF document text
    • http://rubuvajaroxe.epizy.com/74779977863.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_off0000d378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD378 5784 bytes
SHA-256: 4fb1596a6179dc026ba2389b866588f774817d5457516e20a0d3a01b914a206e
font_01_sfnt_off0000e729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE729 10668 bytes
SHA-256: 979c96e54b6a4ec3dc3dba66ce8617bc0b5af6f24e14520ea320743b795d7450