Malicious PDF — malware analysis report

Static analysis result for SHA-256 4266adcfcd4ef3df…

MALICIOUS

PDF

80.3 KB Created: 2021-02-23 14:41:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0ba12d117e114a25bc379ec404ee7ef4 SHA-1: bc316c795aaeb118244b2f6106b16dabc7f7282a SHA-256: 4266adcfcd4ef3df7b450ead3f68a8222bc18c228d3019c7d36e9b4c085f0055
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious campaign, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://crophysi.ru/wix?keyword=oak+grove+plantation+alamance+county+nc PDF link annotation
    • https://bigikudas.weebly.com/uploads/1/3/0/7/130775628/7811153.pdfIn PDF document text
    • https://kipowiginudi.weebly.com/uploads/1/3/1/3/131383469/wemaxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426687/normal_602af1a6da29d.pdfIn PDF document text
    • http://sodalabs.pro/how_to_pair_playstation_3_controller_to_amazon_fire_stickarwuq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382966/normal_5fedd30e3a64a.pdfIn PDF document text
    • https://vemetufubejukat.weebly.com/uploads/1/3/4/3/134367776/3c319f.pdfIn PDF document text
    • https://cdn.sqhk.co/kurafuso/ifhdhgQ/webuj.pdfIn PDF document text
    • https://wepifoxo.weebly.com/uploads/1/3/1/4/131437594/886a2aad110.pdfIn PDF document text
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/jupuvubunuw.pdfIn PDF document text
    • https://jawifeguviweti.weebly.com/uploads/1/3/2/3/132302916/fowokuxijugupe-mikuke.pdfIn PDF document text
    • http://netekigupi.22web.org/netbeans_for_windows_7_64_bit.pdfIn PDF document text
    • https://dezitatukuti.weebly.com/uploads/1/3/5/3/135389988/botadixixa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425768/normal_601bb3eb37a0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418401/normal_60254066009c4.pdfIn PDF document text
    • https://radisowe.weebly.com/uploads/1/3/4/3/134366404/6cb853813bf5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10012 5328 bytes
SHA-256: 1e54c0a9e6868d13d920e065b05ea244deb7b36c30aba41c40773a39eb937605
font_01_sfnt_off00011233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11233 9980 bytes
SHA-256: c9faf114e2b2c828acdd98ec08560e4434e02142fc5b0e84fabdb49a95d8b1f1

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