Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cbde0d025c48b90…

MALICIOUS

PDF

82.6 KB Created: 2021-05-27 06:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b42787a05327f8db55616c4986690ef4 SHA-1: 51c711bf478edccebb7baea109ed53ce3f8be28e SHA-256: 5cbde0d025c48b9076dd24f28bc1496dc5856abac3ce90bac40067fac85f8652
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=how+to+flirt+with+a+vietnamese+girl PDF link annotation
    • https://tofavasexivefet.weebly.com/uploads/1/3/4/5/134578877/worulapazedinikukoto.pdfIn PDF document text
    • https://lefagetali.weebly.com/uploads/1/3/2/3/132302894/59e5c5dc6e2524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420760/normal_6019d99f4b185.pdfIn PDF document text
    • https://motubisirewu.weebly.com/uploads/1/3/4/5/134529252/7269257.pdfIn PDF document text
    • https://wuwudaxu.weebly.com/uploads/1/3/4/4/134493329/7373332.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409103/normal_5fee75d9e37ef.pdfIn PDF document text
    • https://kazowutulegopos.weebly.com/uploads/1/3/5/3/135324393/vajejixexatobunajux.pdfIn PDF document text
    • https://jaxizunup.weebly.com/uploads/1/3/4/8/134885867/931439.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483349/normal_601ba91f0f691.pdfIn PDF document text
    • https://sinuvuliwazima.weebly.com/uploads/1/3/1/8/131871572/1726102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499999/normal_60568e0217a02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371787/normal_60030975c085e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_606c661cc3c03.pdfIn PDF document text
    • https://duvujisukodat.weebly.com/uploads/1/3/4/6/134674851/kosudilepixi-gaxolamaxojegiz.pdfIn PDF document text
    • https://xalidowugeduvek.weebly.com/uploads/1/3/7/5/137514787/jexixu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450732/normal_6000cd2a4b8de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383925/normal_60542e623d48f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377909/normal_60571635b3e75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387061/normal_605f90c93d920.pdfIn PDF document text
    • https://dobizonetalede.weebly.com/uploads/1/3/5/3/135394553/boxokum.pdfIn PDF document text
    • https://jatekowi.weebly.com/uploads/1/3/0/7/130776123/dekujapiwi_jixuvavofid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390323/normal_6044a0754278d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445334/normal_6068cef931afc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_602be3d7aece6.pdfIn PDF document text
    • https://nazizuvadonilu.weebly.com/uploads/1/3/4/5/134590702/zigepemovevavutid.pdfIn PDF document text
    • https://xifamileg.weebly.com/uploads/1/3/4/6/134687686/puxadenuwoji_ripotusagat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393189/normal_606abef3d1248.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DA 5084 bytes
SHA-256: 39e90f28a5751c0a64302cd8e82abbe8eb82900be083bec7f155022a21bdbd9b
font_01_sfnt_off00010705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 11132 bytes
SHA-256: d33b0bd45987d5d8734f0d257235fa65a75cb772b38179cd2b8aa553355050a5
font_02_sfnt_off00012cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC8 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3