Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcab3552d5b5833a…

MALICIOUS

PDF

81.3 KB Created: 2021-05-26 23:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dd860d39b44be8cf5024f6f168a38da1 SHA-1: 11b36bd23f943fa7ac17f5bad42778428870b51e SHA-256: fcab3552d5b5833ae1685afbd9ab12427af1e6fd1a7ec2058c55badea86886c1
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9954

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jumiwimov.ru/strik?utm_term=worcester+bosch+mt10+user+instructions PDF link annotation
    • https://defavelusanopef.weebly.com/uploads/1/3/5/3/135345674/viwojuvawedajir-xejaxijida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_602034cb8b5df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367648/normal_5fc91fd51961f.pdfIn PDF document text
    • https://motoburibekisi.weebly.com/uploads/1/3/4/6/134623685/be6dd.pdfIn PDF document text
    • https://zufuvedowenekoz.weebly.com/uploads/1/3/4/8/134861022/9720809.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406775/normal_5fcbb077402ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470223/normal_6052e5be0c9c1.pdfIn PDF document text
    • https://naguruzitu.weebly.com/uploads/1/3/4/3/134369267/1935288.pdfIn PDF document text
    • https://sikenobavusemel.weebly.com/uploads/1/3/2/6/132682861/kikewin-dotufaxuni.pdfIn PDF document text
    • https://xesuxikoju.weebly.com/uploads/1/3/4/0/134095833/banupoluvalawig_fanijokagipefa_sakexefopilot.pdfIn PDF document text
    • https://gatikewud.weebly.com/uploads/1/3/4/3/134382011/9070135.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454544/normal_5ff960adc16d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413346/normal_601a6f62b5fda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471240/normal_60247d0facb4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410462/normal_603419a45dff3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466689/normal_6060eded47e7d.pdfIn PDF document text
    • https://fiwisiroveton.weebly.com/uploads/1/3/4/3/134339953/wuriwivawufanuraw.pdfIn PDF document text
    • https://dusomekekonipa.weebly.com/uploads/1/3/4/5/134580960/dufos.pdfIn PDF document text
    • https://wotakowa.weebly.com/uploads/1/3/4/8/134885303/vinox.pdfIn PDF document text
    • https://difodofixipa.weebly.com/uploads/1/3/0/8/130814112/nalobawos_jafewovin_wupebijane_raximodu.pdfIn PDF document text
    • https://bizupewikanawa.weebly.com/uploads/1/3/5/3/135321725/rofijulavufodarak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426675/normal_601e13a347528.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
    • https://uploads.strikinglycdn.com/files/ed6b6d94-ba2d-4289-9074-ce1b7d9bf4d7/aeron_chair_alternative.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f67d8c69-300e-4317-9474-1f76280a5f7d/baby_girl_names_2018_unique_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e01fb077-7a32-4c55-8cc5-097aab499d1a/how_much_does_painting_with_a_twist_pay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cac1d6d6-c5ea-4cb3-9773-c8c73a6c7982/ante-nicene_fathers_volume_10.pdfIn 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_off0000f3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 5024 bytes
SHA-256: 856146ecea807daa165259e7a4681f49b678011cbdf5d5667341b3bd8d88ae54
font_01_sfnt_off000104e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E4 10624 bytes
SHA-256: f157f059c1293593a5e54f068b374dfe49d2f1c34728cd38c1578fa099f820d9
font_02_sfnt_off00012948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12948 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361