Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfde3eed1627f0e…

MALICIOUS

PDF

81.2 KB Created: 2021-06-11 02:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 894ffb170a52e93a13747dad6d220f46 SHA-1: 7d990a00cf5d578a2c3e4d1af6a63655e2eee4bc SHA-256: 4dfde3eed1627f0e94032b7e429bc504c1b9adca631c8bd74d667d8942d1a2db
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains a large number of external links, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the overall structure point towards a phishing or malicious redirection attack, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/123?utm_term=tcs+campus+commune+quiz+questions+and+answers
    • https://bukudavura.weebly.com/uploads/1/3/0/7/130739260/rames.pdf
    • https://livuwijonirib.weebly.com/uploads/1/3/4/7/134732661/8000109.pdf
    • https://nikoxekuw.weebly.com/uploads/1/3/5/3/135345322/xixemokekigumix-fewapine-zatikonob.pdf
    • https://cdn-cms.f-static.net/uploads/4465949/normal_605281bdbd41c.pdf
    • https://nikovazof.weebly.com/uploads/1/3/2/6/132682709/1754130.pdf
    • https://vetajovowevisak.weebly.com/uploads/1/3/4/7/134715596/96180341eab8.pdf
    • https://kolukofutire.weebly.com/uploads/1/3/0/7/130740340/fasikobufujosisez.pdf
    • https://cdn-cms.f-static.net/uploads/4414156/normal_60192fb48ced0.pdf
    • https://cdn-cms.f-static.net/uploads/4475852/normal_605711ce59865.pdf
    • https://static.s123-cdn-static.com/uploads/4493200/normal_6004e05895c52.pdf
    • https://cdn-cms.f-static.net/uploads/4389805/normal_606b1093b78aa.pdf
    • https://cdn-cms.f-static.net/uploads/4421339/normal_600de2f8010d0.pdf
    • https://siwelizotelet.weebly.com/uploads/1/3/1/4/131437983/2687651.pdf
    • https://cdn-cms.f-static.net/uploads/4464055/normal_602ff6cf48b48.pdf
    • https://static.s123-cdn-static.com/uploads/4449783/normal_6005d9bf96aff.pdf
    • https://bazapefonufoteb.weebly.com/uploads/1/3/4/6/134637130/negunijerumagez.pdf
    • https://cdn-cms.f-static.net/uploads/4486743/normal_600c6f25ec1fd.pdf
    • https://jezuvafu.weebly.com/uploads/1/3/5/3/135348480/3187756.pdf
    • https://cdn-cms.f-static.net/uploads/4527859/normal_601401e9f0127.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2a053a60-08a1-42c7-b5ac-3546764203b4/warcraft_3_reign_of_chaos_frozen_throne_cd_key.pdf
    • https://uploads.strikinglycdn.com/files/343486b2-6da1-4146-862d-dcf01391672c/11253765540.pdf
    • https://uploads.strikinglycdn.com/files/f2c8cb4a-dcb2-4772-be03-a3df893114e9/59783590446.pdf
    • http://xafusigivu.pbworks.com/f/4000299654.pdf
    • http://lijunew.pbworks.com/f/21823918951.pdf
    • http://jujupaw.pbworks.com/f/35766821253.pdf
    • http://vafobotigef.pbworks.com/f/nonton_streaming_fast_and_furious_9_sub_indonesia.pdf
    • https://uploads.strikinglycdn.com/files/9902a89d-a79e-4fe2-aaab-f77166e8452d/84629353328.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_off0000fc88.bin
4372b25b4209e660ea6402d82ea61b10aa1119324eb8d610cc51a32f126aac03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 5404 bytes
font_01_sfnt_off00010eec.bin
b41138bc4858551737513e901935cd0dd2a590e71050fb6ac80e7b7736669e9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEC 11320 bytes

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