Malicious PDF — malware analysis report

Static analysis result for SHA-256 f397f1f399be9a27…

MALICIOUS

PDF

67.9 KB Created: 2020-11-10 02:31:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5d1e912d7931ec65f59d69ce9d894469 SHA-1: 36ec8bc8e5044bf945cbae4e78ec68de5e2e6c13 SHA-256: f397f1f399be9a2729dc3ea9cf5f343e2c75867be6310aa27d36b813b904a11e
244 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with critical heuristics indicating it points to known malicious redirector infrastructure and a large link farm. The ML classifier and ClamAV also flagged this as malicious. While no scripts were extracted, the presence of these links suggests a phishing or SEO spam campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/123?keyword=secrets+of+the+vine+book+pdf In PDF document text
    • https://zozilevijuni.weebly.com/uploads/1/3/1/3/131383476/5975284.pdfIn PDF document text
    • https://gawubodukajine.weebly.com/uploads/1/3/0/9/130969599/wunilek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471273/normal_5fa538669a8ee.pdfIn PDF document text
    • https://netokuwusava.weebly.com/uploads/1/3/4/3/134384506/1598008.pdfIn PDF document text
    • https://xezuzevujuniz.weebly.com/uploads/1/3/4/5/134586082/mabovuke.pdfIn PDF document text
    • https://vupimolafi.weebly.com/uploads/1/3/1/3/131398504/4367980.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/e724ce1d-723d-435f-8e60-2550d39e4698/labebimodatuwovupowamagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8f2013e-ec19-4d4f-8dd3-cff8b34a95fb/96286375874.pdfIn PDF document text
    • https://s3.amazonaws.com/pukasojalu/define_extensive_commercial_farming.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/shearon_harris_lake_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d325dfd-4833-4194-8f1c-1905752d6ea8/sadobobagufonojimoxale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2aebf50-e089-4290-bdd0-dc9829099d1c/doburabopudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01e97af5-4bc4-4daf-be55-b92cc7beaf0e/pixoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9cf8497-1fde-4098-8f1f-0cc9ad05c778/zubebegovuwizezuzikowas.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_off0000ce75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE75 5368 bytes
SHA-256: 158b68137757930f46dc8e9cf25589bb4b4f36ce386e58cead9fc557cac1b2fc
font_01_sfnt_off0000e0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 10112 bytes
SHA-256: 5824d55585ba4544350ebfcf3c32ae2de5a404b58d02ef860fb928ae83301b1a

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