Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5227dbdf5fd83c…

MALICIOUS

PDF

67.4 KB Created: 2021-02-09 08:59:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2de8815d47d52f271f7174c7cc536478 SHA-1: 31efcace1dc2387931a92f00430d0e6cac4db3db SHA-256: db5227dbdf5fd83caf6d97333a7991334341ff5e85956b9bfa1d78d368ab8c46
260 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are hosted on disposable domains or known redirectors, indicating a link farm designed to lead users to malicious content. The document body, though heavily obfuscated, contains keywords related to consumer reports and refrigerators, likely serving as a lure. The presence of ClamAV detection and ML flagging further supports its malicious nature, suggesting it's a phishing or malware distribution document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://yafferge.ru/wb?keyword=consumer%20reports%20refrigerators%202018 In PDF document text
    • https://cdn.sqhk.co/dofexoxev/jeia7hb/setting_org_2021.pdfIn PDF document text
    • https://wofofubuw.weebly.com/uploads/1/3/2/7/132710679/9d58e6c0b0da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_60112753efb8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495042/normal_601040c7f10cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372080/normal_6016cac296659.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/ijb65Wi/5874438423.pdfIn PDF document text
    • https://cdn.sqhk.co/gopuxipo/Hicxjid/kopavivibe.pdfIn PDF document text
    • https://cdn.sqhk.co/zutijujes/TQihfja/city_story_game_download.pdfIn PDF document text
    • https://suxozunepewax.weebly.com/uploads/1/3/2/8/132814427/lazulipufuram.pdfIn PDF document text
    • http://sikuwolawotoja.22web.org/77129778216.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lokimutopilar.epizy.com/266059580.pdfIn PDF document text
    • http://tefinavi.epizy.com/almaany_arabic_arabic_pro_apk.pdfIn PDF document text
    • http://nawatelobuj.rf.gd/rexupidirameto.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_off0000c938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC938 5616 bytes
SHA-256: fc22e40117b1e3bc1450e8838a3ed36dbfc635a0bd2e5439383395c1d6ccae54
font_01_sfnt_off0000dc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3C 10848 bytes
SHA-256: dde650b4f73a96c366746f7c46a3786eee4db6cadb6b81b427ea45ed4ceebef4

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