Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c574232278509e2…

MALICIOUS

PDF

77.2 KB Created: 2021-04-28 05:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 77ebdc1a0df67bdc1e87a24ba20d6c1d SHA-1: 27e0e32c364873a27134c8a3131980752a8ca0df SHA-256: 2c574232278509e28a33364df0bbd3f8fa3ef425b6c123a75bee60c88ef59c17
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'z score table' and 'wkhtmltopdf', suggesting a lure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' strongly indicates malicious intent, likely to redirect the user to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/strik?utm_term=how+to+see+z+score+table In PDF document text
    • https://cdn-cms.f-static.net/uploads/4473056/normal_600e28401f307.pdfIn PDF document text
    • http://stroy-level.ru/ninja_300_service_cost_2020tf4d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448116/normal_6017bac889bfb.pdfIn PDF document text
    • https://mobejameraxoluv.weebly.com/uploads/1/3/5/3/135316129/mifununulawusop_mutawarivuborap_rigugozozab.pdfIn PDF document text
    • http://gexomafe.mypressonline.com/what_is_in_jesus_name.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498997/normal_600be41d701b4.pdfIn PDF document text
    • http://fitness1.space/which_cars_have_homelinkdh01o.pdfIn PDF document text
    • http://fitokapss.xyz/pokiwovemodefudofa31oqi.pdfIn PDF document text
    • http://busforpay.online/sajejidojunejnxl.pdfIn PDF document text
    • http://romeita.fun/paris_casino_las_vegas_table_gamesabqu0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380082/normal_6056d0cb257bf.pdfIn PDF document text
    • https://dezuvamugofa.weebly.com/uploads/1/3/4/1/134131805/nekimez.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/kejerusifewafu.pdfIn PDF document text
    • https://rizegenaw.weebly.com/uploads/1/3/4/1/134108854/123240.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bugenuvumap.atwebpages.com/41049056872.pdfIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_0f1e4b48d99740c08bbd13c4466b6c54.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c5d7bba-6611-4d3f-acb3-d2838f702559/the_spy_paulo_coelho_ebook.pdfIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_a2a3f7fc29254cfd8d27c5a0f9bab38e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5bac88a-ed83-48ed-90f4-bc0f4ec09682/citizen_eco_drive_world_time_manual.pdfIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_5e73fc86dbe14ec09cf1e4e48044f379.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5954faf-3083-48a1-88d8-f493f60f8852/is_amazon_going_to_rule_the_world.pdfIn PDF document text
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_f44cc9c004d24f828f46ddc2e3ab697d.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15A 5036 bytes
SHA-256: 0ff9dc50bebc55b527760002cdc43b922ebac48aadaa9b179673b1254588348f
font_01_sfnt_off000102a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A0 10660 bytes
SHA-256: 0215f2d23baf03425979a02dc0b9b59e06f77120f3a343c9016598c3254fca88