Malicious PDF — malware analysis report

Static analysis result for SHA-256 a906f3412d87d984…

MALICIOUS

PDF

82.6 KB Created: 2021-05-26 23:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d2503ecc76ba8db8241d6d3536a72efa SHA-1: 720e55d448a108c4de2c2d507fe07163921279d0 SHA-256: a906f3412d87d984d5746cdc9927d58e252bbf305a24f5a25fde14ac245eac79
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://mezovuduw.ru/strik?utm_term=vida+e+obra+de+ant%25C3%25B3nio+agostinho+neto+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407562/normal_601a2822b6fc0.pdfIn PDF document text
    • https://wokegoje.weebly.com/uploads/1/3/4/0/134040701/3c1987.pdfIn PDF document text
    • https://tutiwelureno.weebly.com/uploads/1/3/4/7/134714557/f51ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422909/normal_5ff60707aabc7.pdfIn PDF document text
    • https://kilunifogewawo.weebly.com/uploads/1/3/4/4/134457757/b46af6efe9b92.pdfIn PDF document text
    • https://zuripuwa.weebly.com/uploads/1/3/2/7/132740693/gozukewosazugipimeb.pdfIn PDF document text
    • https://raverigetotip.weebly.com/uploads/1/3/7/4/137499276/f3e06c.pdfIn PDF document text
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/2617752.pdfIn PDF document text
    • https://viwetefebelogup.weebly.com/uploads/1/3/1/8/131857445/7c07b6.pdfIn PDF document text
    • https://sigajijatikad.weebly.com/uploads/1/3/1/3/131379485/zanepagorosar.pdfIn PDF document text
    • https://wupugosow.weebly.com/uploads/1/3/1/3/131382590/7fb0977.pdfIn PDF document text
    • https://fojomifurinu.weebly.com/uploads/1/3/1/3/131378835/3ff3e0f540354d.pdfIn PDF document text
    • https://zijubanefim.weebly.com/uploads/1/3/4/3/134349059/dd9223f.pdfIn PDF document text
    • https://gikapizuwixa.weebly.com/uploads/1/3/4/0/134097763/labafuliwe-nobofegizaduz.pdfIn PDF document text
    • https://bogobesupagal.weebly.com/uploads/1/3/0/7/130775478/zagiwadogasegiwu.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/c182df96-3e26-42e9-90d2-d24d66456eca/toyota_camry_2018_se_wheel_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aacab66-8e99-4d66-9e59-c22fec014a3a/78369995627.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_off0000fefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFB 5512 bytes
SHA-256: 27364fb4ecedbe4047ea69584e9fac7dce9ec9addcb5eadf923471715acbbac0
font_01_sfnt_off00011172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11172 13676 bytes
SHA-256: 1564288cc7ac1a555876ed3eb86c8c3915bf24009df743594e7de31e2263b69d

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