Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade90191e0eda883…

MALICIOUS

PDF

88.0 KB Created: 2021-05-22 02:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a273e646c5b4597c3386d75cebb4e7b SHA-1: 921b168a9a5829736c1c57bdf3abe1e7ee25a950 SHA-256: ade90191e0eda883af6e8aac11227c8925b0020ff6a21e8bc938c7e5478a7543
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://vilenefex.ru/strik?utm_term=8th+grade+science+questions+and+answers+cbse', is likely a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://vilenefex.ru/strik?utm_term=8th+grade+science+questions+and+answers+cbse
    • https://wepusiviji.weebly.com/uploads/1/3/4/6/134661614/povurinifi_dexugijekesasel.pdf
    • https://nibotilujegaw.weebly.com/uploads/1/3/1/3/131381886/zezipep.pdf
    • https://zulitaxovali.weebly.com/uploads/1/3/5/3/135351491/jumokuditulizig.pdf
    • https://tezimapegimera.weebly.com/uploads/1/3/0/9/130968984/8485917.pdf
    • https://malekijewa.weebly.com/uploads/1/3/0/8/130813883/4294462.pdf
    • https://cdn-cms.f-static.net/uploads/4380411/normal_606e6027710de.pdf
    • https://cdn-cms.f-static.net/uploads/4408188/normal_604b3d2bd5d87.pdf
    • https://gazutegib.weebly.com/uploads/1/3/5/4/135400758/lodikomenilalo.pdf
    • https://static.s123-cdn-static.com/uploads/4385847/normal_5fece8947e055.pdf
    • https://bivesazi.weebly.com/uploads/1/3/4/6/134652180/panuzaweg.pdf
    • https://radefikifuru.weebly.com/uploads/1/3/4/7/134723330/lexowewevazeje.pdf
    • https://memebewaliz.weebly.com/uploads/1/3/0/7/130775997/ae433e107b.pdf
    • https://bawidonawasaz.weebly.com/uploads/1/3/4/3/134354070/26fa62fce8.pdf
    • https://rajopolaxobi.weebly.com/uploads/1/3/1/4/131406270/polobiga.pdf
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/dolurugarapamud_paseda_luxuliwemi.pdf
    • https://cdn-cms.f-static.net/uploads/4494866/normal_6024c56384ff2.pdf
    • https://cdn-cms.f-static.net/uploads/4449392/normal_60622d4824ebc.pdf
    • https://cdn-cms.f-static.net/uploads/4374860/normal_600a90c0a8a9d.pdf
    • https://penaxixix.weebly.com/uploads/1/3/0/8/130813526/murez-figuni.pdf
    • https://rusipamisu.weebly.com/uploads/1/3/4/0/134017355/8101651.pdf
    • https://litalegikuga.weebly.com/uploads/1/3/4/5/134587653/c046ec9e361aa.pdf
    • https://desalipi.weebly.com/uploads/1/3/2/6/132681317/vunanowuzu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110b0.bin
aa7eb356d099d6c835082395d4451fed25fdb81fa914ceb8ffad086014998193		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110B0 5628 bytes
font_01_sfnt_off000123cb.bin
a7921e1f22a3b9f131f1d26e0a30b1579b95f06bc21b675b004e759a1faecb7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123CB 1728 bytes
font_02_sfnt_off00012c66.bin
d649bd73649d7a5a457135f1b11fd67c51560b06ad379642f27a1880d0528e35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C66 11068 bytes

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