Malicious PDF — malware analysis report

Static analysis result for SHA-256 06fb39f3a00c0570…

MALICIOUS

PDF

77.2 KB Created: 2021-04-29 03:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2032fda2744cba2812deae44840e8c77 SHA-1: 26631b1c0f511b5375534280f5b6dfa6ba81652c SHA-256: 06fb39f3a00c057016470aa2008f2701a980a7a07354fcb8a1547b6ae4cfc325
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=tcp+ip+guide
    • https://gajegebukorivip.weebly.com/uploads/1/3/4/4/134487765/cdc8e1a.pdf
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5fd9e5c301869.pdf
    • http://moreprodukti.com/15792521116is20h.pdf
    • https://cdn-cms.f-static.net/uploads/4411935/normal_600fb4138ada7.pdf
    • https://static.s123-cdn-static.com/uploads/4414174/normal_5fee9d34b3dc3.pdf
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5fe7debfb45e8.pdf
    • https://tiwibuvemugijaj.weebly.com/uploads/1/3/0/7/130776889/fepexutagakum.pdf
    • https://sulezesolujoseg.weebly.com/uploads/1/3/1/4/131452841/2fcda4a0e7e7e8.pdf
    • https://fofapabijutoza.weebly.com/uploads/1/3/4/7/134713913/rogepuwapudiza_xegew_sajoparu.pdf
    • https://cdn-cms.f-static.net/uploads/4462688/normal_6059d8158843f.pdf
    • http://www19216801.site/duxadokepazibgqk3m.pdf
    • https://finamiwowekizo.weebly.com/uploads/1/3/2/3/132302732/3889274.pdf
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/jifuf.pdf
    • https://cdn-cms.f-static.net/uploads/4416939/normal_60436bf48a1bf.pdf
    • https://tepewumulu.weebly.com/uploads/1/3/1/3/131384412/5ed74a32f745f.pdf
    • https://cdn-cms.f-static.net/uploads/4480584/normal_605ffcdab407f.pdf
    • https://taregegojife.weebly.com/uploads/1/3/3/9/133997559/nuzezodo.pdf
    • https://static.s123-cdn-static.com/uploads/4489993/normal_5ff3c0876f628.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/12588939-2f65-4dc2-9bfd-e3aab46e86c4/xbox_360_controller_driver_mac_catalina.pdf
    • https://uploads.strikinglycdn.com/files/bbeea386-a48f-4254-8ad9-aae8949218de/zombie_apocalypse_movies_on_netflix.pdf
    • https://uploads.strikinglycdn.com/files/0dc5f85c-0440-4da1-aed5-87c6622510ff/23604968233.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f415.bin
303a4d743f495d21281fd6873e5b2c58c4657d3955b43d319eb4a55cf164a1a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 4676 bytes
font_01_sfnt_off00010419.bin
dec419e71446dc2d1800a68acadcbda4ce0ccf1dd7ad86c50a2ba81bd9d5155a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10419 10476 bytes

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