Malicious PDF — malware analysis report

Static analysis result for SHA-256 699531d77c17297a…

MALICIOUS

PDF

79.6 KB Created: 2021-04-28 11:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: fcf716eb6005bfd71041bf6304562053 SHA-1: 69351d4a3e0faa866356ea5f14f205a65cd81fb7 SHA-256: 699531d77c17297a7553fbb515f0f6001cb02c1e49b30e09641e4f466ac7169f
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning attempt. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs indicate potential for malicious redirection or exploitation, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/strik?utm_term=diablo+2+mods+2020+reddit PDF link annotation
    • https://buketopol.weebly.com/uploads/1/3/4/0/134013372/7645081.pdfIn PDF document text
    • https://vaxinukosiju.weebly.com/uploads/1/3/4/6/134625250/zozute-datexitewon.pdfIn PDF document text
    • https://fagutefoxod.weebly.com/uploads/1/3/4/2/134235025/bekinoxotus-xabuxovatupax.pdfIn PDF document text
    • https://rajilogibakew.weebly.com/uploads/1/3/5/3/135326989/426926f.pdfIn PDF document text
    • https://kefejuze.weebly.com/uploads/1/3/1/6/131606268/5300543.pdfIn PDF document text
    • http://lienforkid.com/a_series_of_unfortunate_events_film_netflixpr7oy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476285/normal_5fc73477752f5.pdfIn PDF document text
    • https://sijudunewofas.weebly.com/uploads/1/3/4/6/134696620/segusavekinepakoji.pdfIn PDF document text
    • http://tanenabav.getenjoyment.net/benoxuritejunimukelutaxa.pdfIn PDF document text
    • https://gedepavo.weebly.com/uploads/1/3/5/3/135391693/zolawite_zasizawumi_fesur_zojibubo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366381/normal_5fefa731a7413.pdfIn PDF document text
    • https://godosofebi.weebly.com/uploads/1/3/4/6/134651625/058769f.pdfIn PDF document text
    • http://faceit.su/how_do_you_crochet_a_baby_sweater_for_beginnersviq74.pdfIn PDF document text
    • https://xevezuwojuko.weebly.com/uploads/1/3/0/7/130740392/b6448d18d29fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413573/normal_6049ac3e3ba1c.pdfIn PDF document text
    • https://bosubunu.weebly.com/uploads/1/3/4/6/134693877/vudiforuv.pdfIn PDF document text
    • http://tihefers.online/502720032650fa2x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366987/normal_5ff7d3cd8ac1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412902/normal_603d8c774a7f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nofolimuri.myartsonline.com/cerf_volant_choristes_partition.pdfIn PDF document text
    • http://mitawepadug.epizy.com/guia_abdominales_hipopresivos.pdfIn PDF document text
    • http://sorubuvevamik.rf.gd/what_is_perception_in_ai.pdfIn PDF document text
    • http://bixozebaxikapos.atwebpages.com/analog_and_digital_signals_and_systems.pdfIn PDF document text
    • http://lalamufimovisex.epizy.com/najafodixepav.pdfIn PDF document text
    • http://fokekamunedas.epizy.com/cranial_nerve_assessment_cheat_sheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF975 5384 bytes
SHA-256: b8bf71dd6c72295ee53dca2e362abd160ba4277dc71dd597e0fd12d45b073ea4
font_01_sfnt_off00010ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA5 10976 bytes
SHA-256: b09f6a0e67fcd0ceab38a621dd46e8ea3a5f3db587197681b3fff96a2a97948a