PDF malware analysis — malicious · a62ee1f26f5fe6f4

MALICIOUS

PDF

80.7 KB Created: 2021-03-08 21:46:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26

MD5: 5bb8543d0c366fe92a90de1614d07363 SHA-1: 4aa3ec6042fdea532cdb56319eb096ede7b6a9b3 SHA-256: a62ee1f26f5fe6f4679f708683bb69f37cf3a1cb70242c49d0d6a1913dda3a2f

214 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'crophysi.ru'. Additionally, it exhibits a PDF link farm heuristic, with numerous external PDF links, one of which is 's3.amazonaws.com/zozofufulolig/dietary_guidelines_for_pregnant_women.pdf'. The ML classifier also strongly flagged this PDF as malicious. These indicators suggest the document is designed to redirect users to malicious or phishing content.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

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 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.
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/award?keyword=habitos+alimentarios+libros+pdf In PDF document text
- https://fixasamajiwige.weebly.com/uploads/1/3/4/3/134318971/a565d91eb218.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4446263/normal_5fcd7b0fa9605.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4417403/normal_6006473da0bbe.pdfIn PDF document text
- http://kmikaerfs.ru/62747512716e1zh7.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4490736/normal_5fd137aa4402c.pdfIn PDF document text
- https://xonokuraku.weebly.com/uploads/1/3/3/9/133988937/bakibuvusenidudo.pdfIn PDF document text
- https://falojabuvo.weebly.com/uploads/1/3/4/7/134774067/2ed6d.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4475563/normal_5fefaf5430318.pdfIn PDF document text
- http://gnfcns.info/57719384883ijvhm.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/zozofufulolig/dietary_guidelines_for_pregnant_women.pdfIn PDF document text
- https://s3.amazonaws.com/remeranexe/asking_directions_esl_worksheets.pdfIn PDF document text
- https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_ab8f6fa9da774dcfad4e351218651066.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/xapota/alien_shooter_4_game_free_pc.pdfIn PDF document text
- https://s3.amazonaws.com/folexapurilowe/performative_allyship_meaning.pdfIn PDF document text
- https://s3.amazonaws.com/gixawetopoli/hp_8625_ink_cartridges.pdfIn PDF document text
- https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_f08a881621d8425ba130238f1bda12f8.pdf?index=trueIn PDF document text
- https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_e671d149bd9c45d9a6009e94aca3c673.pdf?index=trueIn PDF document text
- https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_dd608558402b4deea9363f524d02212d.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/piradi/michel_foucault_what_is_an_author_summary.pdfIn PDF document text
- https://s3.amazonaws.com/muvojugejoxip/percy_jackson_and_the_lightning_thief_review_film.pdfIn PDF document text
- https://s3.amazonaws.com/xulikamul/xuputakazegulufegeduge.pdfIn PDF document text
- https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_dec9b840bd9c437582657d5518df65b1.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/dipafuxe/keriba.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fade.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFADE	5288 bytes
SHA-256: `2c762d70f386aadb7b26d08fd2c5e543c9aa2abb46eeb5a75c545adb4319129e`
`font_01_sfnt_off00010cb5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CB5	11888 bytes
SHA-256: `72d3d8e962648b5a6a8e4d3fb678bd1d6852814b42797658d3fc4a3046242c68`

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