Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c2c00b57863504…

MALICIOUS

PDF

79.2 KB Created: 2021-02-20 08:42:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 105ff3db5c957492e7c9df57c75a95a3 SHA-1: bca5cf7b0a44b64d20ba3e56b00915b062e35e3f SHA-256: f8c2c00b578635042d9cafb709a3efde72530fc3ecca2660c1697f2c2ec18c80
256 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are identified as SEO redirectors or viral-video clickbait, pointing to suspicious domains like maypoin.ru and myirn.icu. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body, while appearing to be about word games, is a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Viral-video clickbait PDF links to suspicious host critical SE_VIRAL_VIDEO_CLICKBAIT_LINK
    Document uses viral/leaked-video lure text and links to a suspicious disposable-looking web host. This is a clickbait/traffic-scam carrier shape rather than a benign PDF link.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://cdn.sqhk.co/gipagigo/fvXgcQZ/runescape_halloween_2020_event_guide.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385020/normal_601cdb5e7954d.pdfIn PDF document text
    • https://mulibini.weebly.com/uploads/1/3/4/8/134881685/sorufofonu_josegazikixaj_dufugamunonoduv_sotemakozomepif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470526/normal_5ff1925954638.pdfIn PDF document text
    • https://reravojune.weebly.com/uploads/1/3/1/4/131406269/6b3971aa.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/ieJdVid/23085791001.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465543/normal_5ff714b63eea3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459180/normal_5ff034327a45a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454673/normal_60204aedcbd9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_601fb6ae2afdf.pdfIn PDF document text
    • http://myirn.icu/13567909390k07pw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5fd61008c8b18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393503/normal_5ff9729867eb7.pdfIn PDF document text
    • https://cdn.sqhk.co/xafukapewe/gKiggei/22537771985.pdfIn PDF document text
    • https://maypoin.ru/wix?keyword=chemistry+elements+word+whizzle+answersPDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469359/normal_6029dd8a82ee2.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000ecc4.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000ecc4.bin)
    • http://www.daltonmaag.com/In extracted file (font_02_sfnt_off000120e5.bin)
    • 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 extracted file (font_00_sfnt_off0000ecc4.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC4 5120 bytes
SHA-256: 946b6eb957b02e30d601d6ad8a3b380cada11b7e49826a8810ef5d543f65486d
font_01_sfnt_off0000fe1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1F 10148 bytes
SHA-256: 43e54883fd9f9f6969ef22016a6f5405d22b0316ea979528dfc6d89f4d6f2733
font_02_sfnt_off000120e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E5 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e