Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a864d4eb4cea282…

MALICIOUS

PDF

76.0 KB Created: 2021-04-24 22:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5aed94fa9c8bc63844336275434ab208 SHA-1: a9fb5bb9b4f58fed96a3fd5e8816651c9b7e7f11 SHA-256: 3a864d4eb4cea2821656a991685bcd226d7e8a9760c0b328a8c1aaa32fc300a1
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, indicating it is likely part of a link farm designed to redirect users to malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, with the primary goal being to lure users to potentially compromised or phishing sites. No scripts were extracted, but the PDF structure itself is used to host numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=sc+1000a+car+battery+charger+manual PDF link annotation
    • http://detonicinitalia.website/ebay_kleinanzeigen_for_germany_apkupe2f.pdfIn PDF document text
    • https://fomoxejuj.weebly.com/uploads/1/3/4/0/134000143/2970d99.pdfIn PDF document text
    • https://jolidezebixisu.weebly.com/uploads/1/3/3/9/133997790/mumamun.pdfIn PDF document text
    • https://jipuzalo.weebly.com/uploads/1/3/4/6/134693454/3242177.pdfIn PDF document text
    • https://gofegupozomo.weebly.com/uploads/1/3/4/4/134479888/pivusated-piluka-wenuzuwogifo-tajegi.pdfIn PDF document text
    • http://bilet-pdd.site/jiwajawubozokefz8gu8.pdfIn PDF document text
    • http://vquest.website/the_religion_of_islam_maulana_muhammad_alitfyaz.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/fokag_jorefujari.pdfIn PDF document text
    • http://trenolgia.buzz/33854713705xja71.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/zixikinulenigudu.pdfIn PDF document text
    • http://opros.xyz/441182110450xg5t.pdfIn PDF document text
    • http://sks-expertiza.ru/photography_studio_nyc8nztv.pdfIn PDF document text
    • http://dsv-trening.ru/vimulavonedudijaqfp4.pdfIn PDF document text
    • http://normaa-id.com/21289391081gtget.pdfIn PDF document text
    • http://aires.fun/jaxisopupulofidexejivazuzvaqq0.pdfIn PDF document text
    • https://kufidadifijerid.weebly.com/uploads/1/3/1/4/131407945/c24d0730e20fbb1.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://extraterrestrials.space/ms_azure_ad_connect2hz8h.pdfIn PDF document text
    • https://fokutape.weebly.com/uploads/1/3/2/8/132814024/putiwavazarata.pdfIn PDF document text
    • https://ruxibudowivuk.weebly.com/uploads/1/3/4/7/134728491/jodomuketix_matumuga.pdfIn PDF document text
    • https://tuvaxijilitug.weebly.com/uploads/1/3/4/6/134668501/litogu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000eaa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 5572 bytes
SHA-256: fc604eb5e051bcd9a7a259c27a16e950dd40a0b85e6562a3f66a7eeb1de7d90e
font_01_sfnt_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 10820 bytes
SHA-256: 2fdc16a0fa08031e59db438d79fdbded7f9ae5095a874a97e88eba863191b53c