Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a71a83eaa60b25…

MALICIOUS

PDF

86.1 KB Created: 2021-03-25 00:56:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e65a057d0cbbd91ca5b47a23a8d1e9aa SHA-1: af1b64967a7e359ac4c819c9c229bb94d333aaf6 SHA-256: 71a71a83eaa60b25564b61818dba162851380a85849cd10fd06c8ac72637db94
194 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the 'Download' heuristic further support the conclusion that this document is designed to trick users into navigating to harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/wix?keyword=glencoe+geometry+chapter+2+test+answers PDF link annotation
    • https://cdn.sqhk.co/fowipovoji/Uieigjf/67985357220.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/Cnjdbf2/international_marketing_notes.pdfIn PDF document text
    • http://creditactive.info/dezopitobuxudekebuwisodoz5t1e.pdfIn PDF document text
    • https://rosavipufek.weebly.com/uploads/1/3/5/3/135315232/811175.pdfIn PDF document text
    • https://cdn.sqhk.co/dedejosewor/uhRhchi/bufavitemisilukuvaniloli.pdfIn PDF document text
    • http://ranking-se.com/swan_lake_piano_duet_sheetmkcrn.pdfIn PDF document text
    • https://cdn.sqhk.co/doxowite/jajaLhc/bavujezarufovalodeforisas.pdfIn PDF document text
    • https://famexowizesiz.weebly.com/uploads/1/3/4/3/134359716/d0c2e27e1b77.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_2e4b62a25efb4e89b1a06e2761145faf.pdf?index=trueIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_838238d191054ec1b99f81c922807da7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/baldor_algebra.pdfIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_1da5f317e7534622a6b53d496eb3b4de.pdf?index=trueIn PDF document text
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_a7c46e7714e1431da1e5789dcac9fc65.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/57284007651.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/ai_vs._machine_learning_vs._deep_learning_vs._neural_networks_whats_the_difference.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/que_significa_no_tener_anticuerpos_covid.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF881 5704 bytes
SHA-256: a7c0c1f161ee9e583ea2c01bc56c2ea2cc0fb4eb4caa4467bbd5fb9b27a44f95
font_01_sfnt_off00010bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDE 11972 bytes
SHA-256: 43385ba451c828e9e21d25100ab9347119a0e89e74f0f455b224dac420580aab
font_02_sfnt_off0001350c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350C 16348 bytes
SHA-256: 04e03717c4e64c0cd727e089627ccd5e5053e9a65fec1ccf595631919006e2fc