Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c477bf5ae02e760…

MALICIOUS

PDF

81.6 KB Created: 2021-03-22 07:53:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d6c10ad67c6a41b6a46d9d35fb9a0af7 SHA-1: 48f7fba6c37371d50f592a181479f982686b4ee2 SHA-256: 0c477bf5ae02e760877f8fea0f2071f5fe56f3d94f9ea53ed553bfcd0e62b17a
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and contains metadata related to wkhtmltopdf, suggesting it was programmatically generated to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crophysi.ru/strik?utm_term=ps3+ejects+disc+on+its+own In PDF document text
    • http://meetdouche.xyz/la_fuerza_de_sheccid_resumenmmxhs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465707/normal_5fdebfe25fc53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372376/normal_6058168470e61.pdfIn PDF document text
    • http://internet-babki.ru/33066989070pxkzy.pdfIn PDF document text
    • https://lopatitegadusi.weebly.com/uploads/1/3/5/3/135311006/4667241.pdfIn PDF document text
    • http://uber-global.com/dell_studio_540_motherboard_diagramr8a7v.pdfIn PDF document text
    • http://insta-sale.site/lyrics_hello_adele_conor_maynard8vwv7.pdfIn PDF document text
    • http://workshop-fb.ru/highway_tourism_and_travel_driver_jobs_in_dubai4bn04.pdfIn PDF document text
    • https://gifetapajuloper.weebly.com/uploads/1/3/4/6/134682222/razigofelodu.pdfIn PDF document text
    • http://tedewirivotu.iblogger.org/helen_gardner_metaphysical_poets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410985/normal_5fdfc319d43e6.pdfIn PDF document text
    • https://nepefesin.weebly.com/uploads/1/3/1/4/131410606/1034703.pdfIn PDF document text
    • http://mufezupep.iblogger.org/finowatedexovulinamonaj.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/test_de_dones_espiritualesqhdx6.pdfIn PDF document text
    • http://cartest.pro/lizexafefifaxuxizipokuker2eeuj.pdfIn PDF document text
    • http://jumazeg.iblogger.org/xiwijizofaxabipis.pdfIn PDF document text
    • http://xteenware.online/star_fleet_battles_romulan_shipsh4gg3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491723/normal_5fd83c470af72.pdfIn PDF document text
    • http://letnesil.xyz/55257662839nhs0y.pdfIn PDF document text
    • https://zelasiboromur.weebly.com/uploads/1/3/1/6/131606405/wigebe_morusiwibapalap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467286/normal_60514990cab51.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://93641f3c-03d3-4c8c-b6db-0fd9bfabe798.filesusr.com/ugd/384ca7_a224a92e66994d86acd93c3802d6b40e.pdf?index=trueIn PDF document text
    • https://62bfe9e3-d01a-456c-9d14-3ac71290fd99.filesusr.com/ugd/cfe640_6e273a20dcd64854b726efb940e4863a.pdf?index=trueIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_ef0e1274bbf64c369a5648551cfda358.pdf?index=trueIn PDF document text
    • http://wawopuviginase.epizy.com/14370956251.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_off00010167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10167 4928 bytes
SHA-256: 2c2da3b122a6f9c6f0627bdd8ba4f3aad01a0f65c0a1f542e0e92ada2c2f34f3
font_01_sfnt_off00011258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11258 10876 bytes
SHA-256: dc042f8ce14d0627c4dc6c6e1ca9f724c19a9fb30236756554dbdf64407fca38