Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f9fa4379285ebd…

MALICIOUS

PDF

81.7 KB Created: 2021-03-13 18:44:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f4bd5d32297e5289234f24fe2c046ae SHA-1: f2a1700d360090baddf18314ddfa2145bfbd6151 SHA-256: 92f9fa4379285ebde1ff0c8350a3876963272e70aee020ee736a7d478049c006
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to suspicious domains, suggesting a link farm or distribution point for further malicious content. The document body is heavily obfuscated, but the presence of external URIs and the overall heuristic firings strongly suggest an attempt to redirect users to malicious sites.

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://maypoin.ru/wix?keyword=chemistry+chemical+reaction+practice+answers
    • http://discovljzg.fun/pakistan_studies_book_class_10gckbk.pdf
    • https://cdn-cms.f-static.net/uploads/4386095/normal_6016441e23c3f.pdf
    • https://forerijekakifur.weebly.com/uploads/1/3/5/4/135401119/7739238.pdf
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/visox-ganar-muretavib-taxugij.pdf
    • http://groshyk.site/fezenimepibajovkj39.pdf
    • https://faniruwesil.weebly.com/uploads/1/3/5/9/135993686/4018695.pdf
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/9884726.pdf
    • https://fumewalifo.weebly.com/uploads/1/3/4/8/134884483/sokedikalibulegav.pdf
    • http://aycotoro7.xyz/41228420020kvko5.pdf
    • http://sadovik.me/borges_y_yo_ap_spanishxb0vf.pdf
    • https://siromalad.weebly.com/uploads/1/3/5/3/135312661/684ffb1a44c815.pdf
    • https://baxorumele.weebly.com/uploads/1/3/0/9/130969728/xeguwarerenipib_losovukaf_lezopa.pdf
    • https://xedowekogo.weebly.com/uploads/1/3/4/6/134609622/77569.pdf
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/ribimilefij.pdf
    • https://cdn-cms.f-static.net/uploads/4464862/normal_60195b213ce13.pdf
    • http://trastenmyqort.online/how_to_fill_bissell_power_steamer6bs4y.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/46bb0f5e-9f34-4d17-a231-5bf68cbe444b/46103737017.pdf
    • https://uploads.strikinglycdn.com/files/548bcd81-7877-4014-87be-14728ceb6fa9/87222183562.pdf
    • http://jipudovisubu.rf.gd/internal_audit_director_job_description.pdf
    • http://biviroromu.rf.gd/72177139380.pdf
    • https://uploads.strikinglycdn.com/files/91f2c4f7-4501-4c27-a2f6-55ffcb9b11ea/3342356668.pdf
    • https://uploads.strikinglycdn.com/files/5d9052c6-8ee7-4692-9d74-384f76068e84/wugexarisowedurufemela.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_off00010046.bin
ec632b646dc6267d0fffb18359ea0cba91d0e64a928bea00600931591605a6d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10046 5272 bytes
font_01_sfnt_off00011217.bin
04978d9a2f82dc4b2c837b216d6976afd3b87054edfa69720bfd23b85f29d813		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11217 10896 bytes

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