Malicious PDF — malware analysis report

Static analysis result for SHA-256 94951b980393140b…

MALICIOUS

PDF

77.0 KB Created: 2021-01-26 18:20:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ddf603b2da216cf066303bb8a204b3c6 SHA-1: e5d40cf7cd63480d34a300615ef7c68fa4d082dc SHA-256: 94951b980393140bce9ad28ef7e8d19ca6a23f7cd4ee9037f8708cc40571924b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, identified as a link farm. One of these URLs, 'https://crophysi.ru/aws?utm_term=formal+evening+wear+dress+patterns', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document's purpose appears to be to distribute links to other potentially malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://crophysi.ru/aws?utm_term=formal+evening+wear+dress+patterns In PDF document text
    • https://cdn-cms.f-static.net/uploads/4483624/normal_5fe9070bd2bd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492240/normal_5fe103940460e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494452/normal_5fee119a6def7.pdfIn PDF document text
    • https://sujibovuf.weebly.com/uploads/1/3/4/7/134705076/gusiru-vezes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405443/normal_5ff28998544c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455898/normal_600155118a98f.pdfIn PDF document text
    • https://gutavavoz.weebly.com/uploads/1/3/4/0/134000423/9681260.pdfIn PDF document text
    • https://bakadowo.weebly.com/uploads/1/3/1/3/131380427/fedibapap_pumin.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/1410103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379498/normal_5fd9da0a30bc8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496360/normal_5fc9e9a49d6b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417648/normal_5fdd0beb5d082.pdfIn PDF document text
    • http://2220202.ru/facebook_marketplace_denver_rentalss02tn.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/didowugorokirug/44723417188.pdfIn PDF document text
    • http://lepugip.epizy.com/poludekijoli.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/95051288799.pdfIn PDF document text
    • http://guxodolabisiruj.epizy.com/futate.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/gezafa.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_off0000ef57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF57 5388 bytes
SHA-256: b6a7fa1c71a4f6bbabbc7335fb31210d59e95e04f94f974999cadfdd4ebc4a55
font_01_sfnt_off000101a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A8 10952 bytes
SHA-256: 7a10f996b5dc05a84c7fb277e6ad322d92b4c7db0c589605ca5cd1c5921fa3b2

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