Malicious PDF — malware analysis report

Static analysis result for SHA-256 909902c4d9270696…

MALICIOUS

PDF

68.6 KB Created: 2021-03-23 15:41:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6960eba8cbf4acf669d67194bd0c72dc SHA-1: 5f009026460f1a777db84497acf96bc51f665616 SHA-256: 909902c4d9270696952be5d5ab7ae469fae5fc588f4768d68017723eead1055a
184 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical alert for a PDF redirector link to dafemum.ru. The ML classifier also strongly indicates maliciousness. The document body contains obfuscated text and references to wkhtmltopdf, suggesting it may be a crafted PDF designed to exploit vulnerabilities or lure users to malicious sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=i%2527m+a+child+of+god+yes+i+am+lyrics+hillsong In PDF document text
    • http://hotsales-com.xyz/photo_app_for_pc_windows_10cyl9w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475392/normal_5fd3d6a825597.pdfIn PDF document text
    • https://gumevuwogixuxuj.weebly.com/uploads/1/3/5/3/135317748/e9817030052ce.pdfIn PDF document text
    • http://vvd.bar/black_s_law_dictionary_5th_editionallqa.pdfIn PDF document text
    • http://lowusonuraku.mygamesonline.org/fomisuwi.pdfIn PDF document text
    • http://vas-rem.ru/fazapotixu58l5h.pdfIn PDF document text
    • https://wuwotozon.weebly.com/uploads/1/3/4/3/134315251/bc512afafe22.pdfIn PDF document text
    • https://cdn.sqhk.co/xiroxozalal/Dhajhgg/survival_kit_space_engineers_not_working.pdfIn PDF document text
    • https://rusuxizebagujam.weebly.com/uploads/1/3/5/3/135302265/maxotogalirulefi.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/boy_in_striped_pajamas_gas_scene.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368221/normal_602abc2c9e9f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_603045a8ac510.pdfIn PDF document text
    • https://cdn.sqhk.co/sesumaku/2X2QhcR/esc_guideline_hypertension.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476133/normal_6037ca2a4da46.pdfIn PDF document text
    • http://tegor.xyz/78450208297ktos5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503035/normal_60158364913fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gogejovuxog.epizy.com/university_marksheet_format.pdfIn PDF document text
    • http://romofimor.onlinewebshop.net/corel_paintshop_pro_2020_manual.pdfIn PDF document text
    • http://gebuvuvoxu.rf.gd/how_to_setup_sony_remote_control.pdfIn PDF document text
    • http://vemewef.rf.gd/bairi_kangna_film.pdfIn PDF document text
    • http://fiwiduropewoxo.rf.gd/10069957432.pdfIn PDF document text
    • http://vumadulel.rf.gd/snap_on_solus_pro_latest_update.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_off0000cea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA8 5508 bytes
SHA-256: e4f28ae3fc6bcc679720db12fb3ea3a74828e21ff1eddaaa0655fc30bb62809c
font_01_sfnt_off0000e14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14B 10416 bytes
SHA-256: a937257954cd556b4fb7e2e8832d07cd85fd42a18db7dd6d71924f72c1fcbae1

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