Malicious PDF — malware analysis report

Static analysis result for SHA-256 85efe39d57f21081…

MALICIOUS

PDF

60.4 KB Created: 2020-11-24 09:51:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4369dbc5d93f048b6c3f9751e7c5049f SHA-1: e3547c59e483891d4e4df66075e02be16346cd60 SHA-256: 85efe39d57f21081692682fa7bc2536fe64c60ed791d9b395461808d735a496a
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link that redirects to a known malicious domain, identified by multiple heuristics as a redirector for phishing. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, appears to contain text related to 'Mama don't worry lyrics', likely serving as a lure to encourage clicks on the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://ggtraff.ru/strik?utm_term=mama+don%2527t+worry+lyrics In PDF document text
    • https://cdn-cms.f-static.net/uploads/4460463/normal_5fa843e009d2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447888/normal_5fb4fdff0c6f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371498/normal_5f9679b25283e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378857/normal_5f8e1b896e5c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367271/normal_5f87b9b163227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472484/normal_5fb73004ef27f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385869/normal_5f9c656693227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5f8dec4ddc588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374364/normal_5fab949589836.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bfea509-4acb-4562-b0a7-9bd216e5040a/9854080193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82ae6066-3e93-4039-a6c4-006758f3d003/hp_pavilion_battery_not_charging.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/56548804298.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/5502031323.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/handover_report_format_after_resignation.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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB331 5320 bytes
SHA-256: b1f0d27b79857081a58943ba1b64e2a65cce7c6537f39c2ed03735c8fffed608
font_01_sfnt_off0000c555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC555 9164 bytes
SHA-256: d15d9e4ec90fb7051d6e3d5e11c509a645834a92f7183a760cf978343fedf9ca

Open this report in the interactive analyzer, or submit your own file for analysis.