Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f5173123764ab9…

MALICIOUS

PDF

80.6 KB Created: 2021-05-11 11:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 36ae8cd9e94c7789d7f3b8a7df80efa2 SHA-1: 23dd2dee15cdf6a36c2746b90f4f23874171e65d SHA-256: b3f5173123764ab96408dbc036d19504e012d43a5d85b50de010dc76133afb94
186 Risk Score

Malware Insights

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

This PDF document functions as a lure, promising a "free 24 hour xbox live code" to entice users to click on a link. The primary link leads to a link farm containing numerous other PDF documents, suggesting a phishing or scam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://lozipotod.ru/strik?utm_term=how+to+get+a+free+24+hour+xbox+live+code PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412403/normal_602c9f6a0a7d5.pdfIn PDF document text
    • https://cdn.sqhk.co/balekunu/Piagi0k/bitcoin_miner_windows_8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368952/normal_6004ad99449d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408873/normal_6000797a666b8.pdfIn PDF document text
    • https://golagunowij.weebly.com/uploads/1/3/2/6/132695575/1c54b3.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/780r2hj/3314991756.pdfIn PDF document text
    • https://nusoselif.weebly.com/uploads/1/3/4/4/134470887/1202e88a8b3ac0.pdfIn PDF document text
    • https://lupawepenotude.weebly.com/uploads/1/3/1/6/131606523/9830044.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445879/normal_5fd1ed500a433.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392209/normal_5fff5bfaaf7ad.pdfIn PDF document text
    • https://dovasivenumi.weebly.com/uploads/1/3/5/9/135965427/212707.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d8fdc18-1da8-4518-af2c-59394331d1f5/53204407048.pdfIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_1b6404f9c5d9491cb7cbce33990d4748.pdf?index=trueIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_0eecc6ebc42548ea95c737100720a03a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/05446513-86e8-4c8b-a5de-3c261e1d1f8b/casio_ga-100cg-7adr_erkek_kol_saati.pdfIn PDF document text
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_ad1d9b376f964f9cba33fe601e40b892.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f1c3ece-fe58-4342-89cb-ccf6c021dbed/how_to_swing_trade.pdfIn PDF document text
    • https://ddc7b23b-31e5-4b5c-aaad-d3b7cef26861.filesusr.com/ugd/e506b8_38f29cb920c5439f9310e05644a4a4ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/47c3aa42-b150-40d0-8a0a-80f00eca4ce6/fozupanadodepasanemudi.pdfIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_0b94c9b6bfab4fb69d751f37d6bd185d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9e39b05-0a2a-4746-b45a-faaf6e5b489b/gonixivugup.pdfIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_fd10b6ba11ea42158cbbc450ad53878f.pdf?index=trueIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_7835dcda97a94ae78ce39feb88f9a05a.pdf?index=trueIn 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_off0000fb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7D 5648 bytes
SHA-256: e5932d4974d684b1e9d3b228d9f224a7c68401c444a1840b8c2b5f9fab7842ed
font_01_sfnt_off00010eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDA 10584 bytes
SHA-256: 4890851c32978a26f4e30f1f848303035bd7dcc1b3f78e12ef250bc225cabe4b

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