Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd9cdd2c5663c140…

MALICIOUS

PDF

80.5 KB Created: 2021-03-27 23:26:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 3e5e4344c7466a853eaeed54c07193dc SHA-1: ed3aa7002803ccd3c71e6334a387ead53a871bae SHA-256: fd9cdd2c5663c14041c2987d01dd77b3ed66bd8a278d9c41a0d84fdabd902f0d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable or suspicious domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. The document body is heavily obfuscated and contains metadata that does not align with typical user-facing content, further supporting a malicious purpose.

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://druttle.ru/strik?utm_term=timex+expedition+scout+40mm+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369336/normal_6027778c18578.pdfIn PDF document text
    • https://latitatuforuza.weebly.com/uploads/1/3/1/3/131398212/7923339.pdfIn PDF document text
    • https://pesawuzopedeg.weebly.com/uploads/1/3/5/3/135327269/gosiwobagen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476294/normal_5fd672d71138a.pdfIn PDF document text
    • https://cdn.sqhk.co/guzorata/ihjAf6Z/862340684.pdfIn PDF document text
    • https://cdn.sqhk.co/xinefegepe/fgegjja/hawgs_mini_zombie_86a.pdfIn PDF document text
    • https://cdn.sqhk.co/dudilabatod/bj82YPm/abc_songs_for_preschoolers_lyrics.pdfIn PDF document text
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/dibago_febupevavava.pdfIn PDF document text
    • https://cdn.sqhk.co/morureju/Nichajf/general_tso_chicken_recipe_healthy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418583/normal_601b421b345fb.pdfIn PDF document text
    • https://xaxusadusu.weebly.com/uploads/1/3/4/4/134497069/lefijuxovuxujono.pdfIn PDF document text
    • http://sejamilipigiseb.iblogger.org/california_dmv_bill_of_sale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tutapaxi/63892076904.pdfIn PDF document text
    • http://retudazugo.rf.gd/cash_flow_statement_format_explained.pdfIn PDF document text
    • http://kitutexedifepi.epizy.com/before_columbus_the_americas_of_1491_summary.pdfIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_c71d122fa51c495c98856ea830152ca7.pdf?index=trueIn PDF document text
    • http://kawanasigupezin.epizy.com/projekt_1065_summary_sparknotes.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/cute_baby_images_for_whatsapp_dp.pdfIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_7706daac3f8b442285bccafea85c59a9.pdf?index=trueIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_9be4cc1600f0403383bfcc519000177a.pdf?index=trueIn PDF document text
    • https://fb075467-9d00-46c6-93ac-2b777f5e584b.filesusr.com/ugd/8bcd66_1de5dbe653444b6cad50923be7e179f7.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 5260 bytes
SHA-256: deb2d8eaddf9f76ba8aaba4b8adbc3b66c62cac687f26b3866257d4bbfcc3e72
font_01_sfnt_off0000ffa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA1 10880 bytes
SHA-256: 2d88a45410087a2002497fcac825fa70a9d9e6af38aa225b16a20e3ffe8bf538
font_02_sfnt_off000124d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D8 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333