Malicious PDF — malware analysis report

Static analysis result for SHA-256 f895ea125ecaf222…

MALICIOUS

PDF

69.6 KB Created: 2020-12-24 12:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 83f2d6d7185e4fddd2d28a67af48ac7f SHA-1: cf0418b11209f1be47e3f956dc41e93e03433ef5 SHA-256: f895ea125ecaf2228b1f1334ddb21dae38935977647fed45351e54723abb28c1
262 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a large number of external PDF links, suggesting a link farm for SEO phishing. The ML classifier strongly flagged this PDF, and ClamAV detected it as a phishing trojan. The presence of a 'download button' lure further supports a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/strik?utm_term=winking+owl+wine+moscato+review In PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/987b21c6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368478/normal_5fe33c0974fcc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449965/normal_5fc7ff8378740.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492875/normal_5faf8c1e03ccd.pdfIn PDF document text
    • https://balesiloruj.weebly.com/uploads/1/3/4/6/134671801/ramifomesofusu.pdfIn PDF document text
    • https://siminanora.weebly.com/uploads/1/3/4/6/134611077/mujidofefu.pdfIn PDF document text
    • https://nukubejale.weebly.com/uploads/1/3/4/6/134631684/4b1c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f88a585362ec.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/dinigugaxej/xikaropolasixawolezixewe.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/xatunaputofipufuzebofom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a46f02ec-a981-4fc1-b53e-f3e4c62336d0/download_chromebook_os_to_usb.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/fudotumezonipasuzubunakap.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/solitaire_tripeaks_gsn_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/95208758655.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 8

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_off0000d298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD298 5348 bytes
SHA-256: a549ce88d6e7df255ffeccb58c13ebe5340c54bdefe639cb2875512140bbcc92
font_01_sfnt_off0000e4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DD 10752 bytes
SHA-256: 12282cef07fa1cd5fcdd18b7e77272b8e8ee98497e4f97921ed53f84d84733b1

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