Malicious PDF — malware analysis report

Static analysis result for SHA-256 499ec028f73d9948…

MALICIOUS

PDF

79.3 KB Created: 2021-04-03 19:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4dff5a80cb6b9a504b3ac702b851f48c SHA-1: 51ea2c69c864208de831baec6e7949ae7ef1f5e1 SHA-256: 499ec028f73d9948e02cd215528b4679928425e9d3eb94b1560b7bfe070b6160
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://druttle.ru/wix?keyword=gta+3+apk+download+revdl PDF link annotation
    • http://raxijinerig.iblogger.org/74454624460.pdfIn PDF document text
    • https://voperupazekeko.weebly.com/uploads/1/3/4/5/134505312/sefupim.pdfIn PDF document text
    • http://kemytbok.xyz/how_to_service_lg_air_conditionerp71ri.pdfIn PDF document text
    • https://bipurubozebupal.weebly.com/uploads/1/3/6/0/136082727/9665363.pdfIn PDF document text
    • http://demask.space/29549130539gwz9e.pdfIn PDF document text
    • http://voztrans.ru/letulisexiwavojcqd2h.pdfIn PDF document text
    • http://newutatokulu.getenjoyment.net/academic_article_example.pdfIn PDF document text
    • http://welitizenowem.mywebcommunity.org/31401467584.pdfIn PDF document text
    • http://nokilibetajew.mywebcommunity.org/autism_spectrum_quotient_test.pdfIn PDF document text
    • https://fojiwuduz.weebly.com/uploads/1/3/5/3/135309278/2324654.pdfIn PDF document text
    • http://zujiran.iblogger.org/setuxuni.pdfIn PDF document text
    • http://topfrag.rip/kezogikagupazadgsmi.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://kulofokugizadeb.22web.org/gapulofutularisafef.pdfIn PDF document text
    • http://tapopapebesawu.getenjoyment.net/54383593261.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_82d304aa53b64aeeb6e8456951d076fa.pdf?index=trueIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_00b2cb4384824cf2899490d95b45512b.pdf?index=trueIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_bf8ffc4d5e6d4774a36f1331e911672f.pdf?index=trueIn PDF document text
    • http://gofuvosopo.epizy.com/surah_al_kahf_in_tamil.pdfIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_591ef9bbd6c74ca888ed197b952317fd.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_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 5184 bytes
SHA-256: 2b9c94f7557dda3b8e4716c4a1bdee6cfbd2b560ad749a76cad14dff9064ca24
font_01_sfnt_off00010b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B22 10832 bytes
SHA-256: a30cde5b581726adc33c0fa52dc28294bb26a6f7e9ec8859060f03397bff2126

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