Malicious PDF — malware analysis report

Static analysis result for SHA-256 488894c049f2bac5…

MALICIOUS

PDF

84.5 KB Created: 2021-04-07 19:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a9d93b935fef0d623f02e42030036888 SHA-1: 0e09bf6423b9543a1bc08248299dec17bd0b861e SHA-256: 488894c049f2bac5ae9c9f62453aa69694b96accec79a80979d755196ab6a97b
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirector infrastructure, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was programmatically generated to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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.
  • 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=does+ab+lounge+really+work In PDF document text
    • http://luzofogobud.22web.org/61838926020.pdfIn PDF document text
    • http://faketikus.22web.org/42139580650.pdfIn PDF document text
    • https://cdn.sqhk.co/donewipimep/U0yI2gj/bulumij.pdfIn PDF document text
    • http://didavixakodix.22web.org/how_to_use_defrost_on_sharp_microwave.pdfIn PDF document text
    • http://zuvibig.22web.org/60988069943.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/jgcvHhj/rt_nagar_news_today.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/p4yidii/solitaire_247_3_card.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/03fff0d9-7fc5-4a02-829f-20d1660b807a/mizuzomulixiwasivuxated.pdfIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_433c6b19297d49489a5df50a6b9adc5e.pdf?index=trueIn PDF document text
    • http://tisudaxutuz.epizy.com/statistical_data_analysis_using_sas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc866a58-89c4-4318-b749-75617f98b6d9/jisebusek.pdfIn PDF document text
    • http://tikolikenugim.epizy.com/perianal_abscess.pdfIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_1177896f3225438e987e3372149183cc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/329d22e9-73c1-4d5a-8ced-22d57cb517a9/dolujiwipazitat.pdfIn PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_3c9ba26bc55d4642a193776451410de9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d24a6bcd-935a-43ff-9b99-5301a15a266f/vajaponugizedol.pdfIn PDF document text
    • http://pomolado.epizy.com/pandoc_templates_location_windows.pdfIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_d82b2d330f5d476aa50dc30d0969ed56.pdf?index=trueIn PDF document text
    • http://jelepodun.epizy.com/50565669412.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f956a503-1fee-44d5-b6b8-c4c1d0c4b453/is_it_worth_investing_in_berkshire_hathaway.pdfIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_3f5d49a495b648a5b78c016d28c4ebac.pdf?index=trueIn PDF document text
    • http://matixonapoler.epizy.com/dowuxalogipusu.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8E 5004 bytes
SHA-256: 8959e9bc3adf8a85a8b225dc6370df8c61e56a8c03cf6d9cf96f29f1ef7b2b9f
font_01_sfnt_off000100aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AA 6068 bytes
SHA-256: 7a02da73c5ff24218d04b188db7d31ceb9303d5dedd43b645f18a615a19d9b6a
font_02_sfnt_off0001105b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105B 10608 bytes
SHA-256: 081cbf0ff7c723b102c96af81d3f7952b1a77104d5d8fd3863e6347aca7fd0e9
font_03_sfnt_off0001345b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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