Malicious PDF — malware analysis report

Static analysis result for SHA-256 296fb6fa6e2838ab…

MALICIOUS

PDF

80.3 KB Created: 2021-04-15 02:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6de3c9eb64f8622d36f8f5ad6e7a55bf SHA-1: 6e966a6706cd87b9557ec23f25cf9539173a91f4 SHA-256: 296fb6fa6e2838aba5205347070fdd829202bdce03c3d22efb67f1b19e2c5ef6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to other PDF files hosted on disposable domains. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these linked documents.

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://botokaw.ru/strik?utm_term=3rd+grade+reading+and+writing+worksheets+pdf PDF link annotation
    • https://geguxawuxereko.weebly.com/uploads/1/3/1/3/131379712/nupadiwiz.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/cBEhgic/mezivin.pdfIn PDF document text
    • https://xuboxale.weebly.com/uploads/1/3/1/4/131452808/zikitukomirepi.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/d8yhjjf/wisafenatalisufoku.pdfIn PDF document text
    • https://cdn.sqhk.co/sawowudin/ioVxjfK/chocolate_pudding_poke_cake_recipes.pdfIn PDF document text
    • https://cdn.sqhk.co/tokofape/rLijjjg/dolomusek.pdfIn PDF document text
    • https://melijavunibujov.weebly.com/uploads/1/3/0/8/130873932/5538982.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/mfiejg9/mazedof.pdfIn PDF document text
    • https://konilusikiwi.weebly.com/uploads/1/3/3/9/133986353/9088092bac3.pdfIn PDF document text
    • https://boxizegovabore.weebly.com/uploads/1/3/1/3/131379280/jeronovajonowen_sikotivifakasuz_kopabev.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/c3f1a337-4465-4c2e-80a4-b7e10dea3187/buxevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6957f92-d733-4b0d-b157-1f3e55c29969/56882093806.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/pufiril.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/play_store_app_pc_version.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/43497467583.pdfIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_1555a4278283401aa0598d35c923626a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5560740f-d1d4-48a2-b489-b9e4795a3a50/44339328935.pdfIn PDF document text
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_52d21f3d60504b068e6f0577a68336df.pdf?index=trueIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_19bf12f206d843ea8ac03fbd2b855e0d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d40cefb-b419-438f-8691-53916a27c812/lapatalulupuwagozuro.pdfIn PDF document text
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_8179a57643ef432c9e57350aefc12262.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f08f939-b3fd-4b00-b27e-c0389cddc8ad/kazev.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_off0000fc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC48 5496 bytes
SHA-256: f7c7dfa9c604e920e72b8ec17c596db4b3fc0a4aa77016120fc93079a74c9fe9
font_01_sfnt_off00010f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F09 10740 bytes
SHA-256: 346ced6131452995a788324530a77137e6d325dc3256a50761f9d38272a59c90