Malicious PDF — malware analysis report

Static analysis result for SHA-256 7261e6338c534fab…

MALICIOUS

PDF

105.2 KB Created: 2021-03-17 20:39:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6f0bdf0531cf50cb1a37c21c761c0935 SHA-1: d330f0069068ee6ef7ff8825b2379b76fe04a93b SHA-256: 7261e6338c534fab9b1339ef411093e13483a9591e7b5970d754fc0fc38d184f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO scam. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a large number of links within a small PDF, designed to drive traffic to other sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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
  • 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://jottigo.ru/wix?keyword=fossil+evidence+of+evolution+answer+key PDF link annotation
    • http://erkutungotu.com/tidonejawebh8hlx.pdfIn PDF document text
    • https://ginekimef.weebly.com/uploads/1/3/0/7/130738874/9642165.pdfIn PDF document text
    • https://bejivuvepezera.weebly.com/uploads/1/3/4/4/134437422/tijotolute-taruwozajilosa-digiz-buwaxid.pdfIn PDF document text
    • http://zezasasipow.iblogger.org/52404242361.pdfIn PDF document text
    • http://rumukisizupew.iblogger.org/junimowemusetaja.pdfIn PDF document text
    • https://feboratopaw.weebly.com/uploads/1/3/1/3/131383734/87de6f.pdfIn PDF document text
    • https://ruzamugube.weebly.com/uploads/1/3/4/0/134040566/sureriw.pdfIn PDF document text
    • http://biomaniix.website/stiletto_nails_2020w0n7v.pdfIn PDF document text
    • http://geleostone.online/97035882708cb5ob.pdfIn PDF document text
    • https://bezofaxifi.weebly.com/uploads/1/3/1/6/131606652/xupijo_xosimesumakimob_bepuj_rigerebanabo.pdfIn PDF document text
    • http://septiki-rf.website/derurekavazewerogeragutdlx1y.pdfIn PDF document text
    • http://chatik85939775.fun/513365464944990b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rajokonola.epizy.com/how_to_sync_summer_infant_panorama_monitor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/803fb53a-db92-4752-97d0-87325076a2d0/buzetu.pdfIn PDF document text
    • https://590703a0-be71-4d3c-a49f-17767d5969ef.filesusr.com/ugd/656c20_3a525be751f4433ba1def1ccc41db7a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wukara/mi_airdots_manual.pdfIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_22e24c9296ac4a5687e20371987f2648.pdf?index=trueIn PDF document text
    • https://5b3fc17b-a4fb-4144-9a53-ff617e35bc6a.filesusr.com/ugd/696117_685683f36ca2457c91bfdc582e7862e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/18b25dfe-5dbe-4bef-b638-1da78a424d1d/what_is_a_lanternfly_permit.pdfIn PDF document text
    • http://kesobikifa.epizy.com/bekefurowogomosixo.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/22944076391.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/nice_guidelines_management_of_hypertension_in_pregnancy.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/98340716784.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/brinkmann_electric_smoker_cover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a20790f5-ef64-4f74-871e-b23a6ce66107/gubevaguzorusesur.pdfIn PDF document text
    • https://0b609444-e5a2-4a7e-9779-a3c6bae51a53.filesusr.com/ugd/529dbf_6a010bcb09ce4a68a5289d6f53c3e662.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_off00016024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16024 5288 bytes
SHA-256: 1e8c66a8435fe4d35d143267354d3eab02a4a9e233bcdbc5b514c38cd68fd5e1
font_01_sfnt_off00017255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17255 10564 bytes
SHA-256: cf9c2e62c8fde0c031c715482476b810f35c902f4e7fb105389353e84ceac22c

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