Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f683615a009bba3…

MALICIOUS

PDF

79.4 KB Created: 2021-02-22 10:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 239db5198baf167c4698a0dd27080859 SHA-1: 81ce6c6f7b9206dc025820272acf4775b5e2ff0c SHA-256: 7f683615a009bba322eddc28ae91f95a62cb7c99b8366df54b247661cb8bce98
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The primary attack pattern involves directing users to a multitude of external PDF files, likely as part of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=a+visual+guide+to+stata+graphics+third+edition PDF link annotation
    • http://sodiwemewobigi.22web.org/30393141083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452624/normal_60311b23bb61b.pdfIn PDF document text
    • https://dibevoxatatot.weebly.com/uploads/1/3/1/1/131164568/tukiledepe.pdfIn PDF document text
    • https://tulugawaluga.weebly.com/uploads/1/3/0/9/130969515/e6b3282c39b946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409258/normal_6015ca4fc8ee2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443824/normal_5fea158921ce3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413469/normal_602fc9a2efd58.pdfIn PDF document text
    • https://revoninutilira.weebly.com/uploads/1/3/5/3/135338282/9e8d669fb8.pdfIn PDF document text
    • https://diwekapuxejube.weebly.com/uploads/1/3/1/4/131455019/lexuxuwomapib-lizim.pdfIn PDF document text
    • https://jujoxiro.weebly.com/uploads/1/3/4/8/134875196/nidamijoz_welametoteg_fakatipo.pdfIn PDF document text
    • http://reestr.site/nikejumisojupc3pj.pdfIn PDF document text
    • https://lofefogurabu.weebly.com/uploads/1/3/1/1/131164054/marisusiw-jekiwewabobo-bidakomigujar.pdfIn PDF document text
    • https://nuzixusimupe.weebly.com/uploads/1/3/4/3/134306281/gopubizeberojum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dagasopones/free_responsive_email_template_for_outlook.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/carissa_grandiflora.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/kakukakojuxafasijasipav.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/zokodujusuzejuxuziv.pdfIn PDF document text
    • http://banumekopi.epizy.com/diroxemibivodal.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEF 5264 bytes
SHA-256: 158082be1b02cdf24ffae30031442d3f75dc02bca7018aa31d4c1d11c759d7d3
font_01_sfnt_off0000fec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC6 10416 bytes
SHA-256: df336e821ea819986a0fa9c1f99aba44ee18e4ae341e8c618062c4323474d427
font_02_sfnt_off00012229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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