Malicious PDF — malware analysis report

Static analysis result for SHA-256 c453a925d6cdbfc1…

MALICIOUS

PDF

71.9 KB Created: 2020-11-26 02:17:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2a2dd292d892e51c68b663715ae35821 SHA-1: 9354cdefaca01bf430fb5c937c1b75769b1d2422 SHA-256: c453a925d6cdbfc15d67f8a563b5ce30f0bdd27d92805c343fee38e3fa7f9c85
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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.
  • 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://gettraff.ru/strik?utm_term=travel+and+transport+layoffs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376371/normal_5f89d16dd1795.pdfIn PDF document text
    • https://donodofi.weebly.com/uploads/1/3/1/8/131856097/7456605.pdfIn PDF document text
    • https://koludoselutak.weebly.com/uploads/1/3/4/8/134893798/8443950.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423750/normal_5f9e26bed6e94.pdfIn PDF document text
    • https://lotetirupaxep.weebly.com/uploads/1/3/4/0/134013035/mimajaxebixuve.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tuzakifezara/lexajovulurip.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/25210907920.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/app_nomao_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/kedevabegibu.pdfIn PDF document text
    • https://s3.amazonaws.com/jolufozo/nupalibilemipefodawaxoki.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/vomisit.pdfIn PDF document text
    • https://s3.amazonaws.com/bodepova/petra_jordan_ap_art_history.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/95976557633.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE6 4888 bytes
SHA-256: 8f0fd5ae9032d584ee54c327ce76ded9a62621df3bf1ab1e87ad2a8113c17163
font_01_sfnt_off0000df9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9B 10828 bytes
SHA-256: 0bc89a34d5e016a638a0c216f0e941b0d1a956b82594ba9a3ed45a8ef10c6b2e
font_02_sfnt_off0001047e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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