Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec81e6fe3ae680d1…

MALICIOUS

PDF

72.4 KB Created: 2021-01-01 17:59:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2a4241a64e637c6abbf3821b6a3a1518 SHA-1: 3126d45c8e0f4316d857de2d99b1c81de5c9c267 SHA-256: ec81e6fe3ae680d1680b77083f6f6d830ef0818b00d588e875f27bdd8b8f872b
194 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a malicious redirector link, specifically designed for phishing. The embedded URL `https://cctraff.ru/strik?utm_term=lion+running+away` is identified as a known malicious redirector. The ML classifier and ClamAV detection further support the malicious nature of this file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/strik?utm_term=lion+running+away In PDF document text
    • https://cdn.sqhk.co/walumupo/gdgcUgd/hit_the_woah_dance_gif.pdfIn PDF document text
    • https://cdn.sqhk.co/punenekebi/dl5ie1v/clash_of_clans_download_windows_7_64_bit.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/71e1fdc6-6275-4f2a-82ad-52ef7bf6a67b/11281602223.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/pivumiz.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/estudios_de_alabanza_y_adoracin_en.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/maplestory_alishan_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/72293735661.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/food_stamps_pa_income_guidelines_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e082ded-ba70-45a1-b4c7-d6d47408fda2/59451921898.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/pugevimemo.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/59401357249.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/26898165207.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/31730555353.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/blob_file_javascript.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/83934457817.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/ruvefanakojogenakaxopogor.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_off0000e024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE024 4776 bytes
SHA-256: c70f2db0bf401a5d14ba2a04ab06fbeba568e4af65ef8aeb99349c5cfffd3860
font_01_sfnt_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 10880 bytes
SHA-256: 0377e490c488f870611dabbacf6e6575b2e93e6d5b79ea3c28926de84229d5e9