Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b277bb41d9f4b5f…

MALICIOUS

PDF

71.6 KB Created: 2021-01-11 11:10:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1eed0bf927b0269a3d415c355c010f5d SHA-1: e0e6436c53e830464c81f35e1975a9ac9a23bbd5 SHA-256: 6b277bb41d9f4b5f6be35e4db516fdc07a84a78a1a93f499cc918489b75d7241
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a significant number of links to external websites, many of which are hosted on disposable domains or known malicious redirectors. The heuristic firings indicate it is acting as a link farm, likely to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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.
  • 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://ggtraff.ru/123?utm_term=parts+of+the+ear+worksheet+ks2 In PDF document text
    • https://badadivuzadan.weebly.com/uploads/1/3/4/5/134523039/7355266.pdfIn PDF document text
    • https://site-1175063.mozfiles.com/files/1175063/68113263010.pdfIn PDF document text
    • https://site-1218703.mozfiles.com/files/1218703/21671060490.pdfIn PDF document text
    • https://zuligaxexepe.weebly.com/uploads/1/3/0/7/130775912/7223156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466175/normal_5faa6540b064a.pdfIn PDF document text
    • https://lusewixitakotaz.weebly.com/uploads/1/3/4/3/134385759/9375084.pdfIn PDF document text
    • https://bomitepoz.weebly.com/uploads/1/3/4/8/134895739/xunolibujexubobodes.pdfIn PDF document text
    • https://site-1177531.mozfiles.com/files/1177531/dapujuwadufakef.pdfIn PDF document text
    • https://lunudarekilaxaf.weebly.com/uploads/1/3/4/3/134315691/xalival-gutobakokego.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/pavujiniz/eclipse_to_intellij_shortcuts_cheat_sheet.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_off0000dd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD78 5112 bytes
SHA-256: 184545c1254cced5ef559627de9fd80e347450f174546310879faa939c58d88f
font_01_sfnt_off0000eeee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEE 10208 bytes
SHA-256: b9014b2086c2dfcad439cdffce81e67e33f5e7a91c256ca95b24299ac56d5312

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