Malicious PDF — malware analysis report

Static analysis result for SHA-256 29dad1ea3b56b04c…

MALICIOUS

PDF

84.3 KB Created: 2021-04-07 08:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cafb508cd8a887fe8b2886e916f731ff SHA-1: 24df27dcddf3d49c9646bf29839a1052e120eadb SHA-256: 29dad1ea3b56b04c9ac2ad06bf27c33c1dd7759c47309b65f9f126dc6c108dd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, with one pointing to a suspicious domain (pelibirifir.ru), suggesting a phishing or malicious redirection attempt. Although no scripts were extracted, the PDF structure and heuristic firings indicate a malicious intent to direct users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/123?utm_term=bug+report+software+open+source
    • http://vobafoselalulor.mypressonline.com/rifekebiwufizogefonutu.pdf
    • https://cdn-cms.f-static.net/uploads/4380405/normal_5fd97770ec44f.pdf
    • https://cdn-cms.f-static.net/uploads/4462992/normal_6010d18ba6281.pdf
    • http://bimizuzi.sportsontheweb.net/31904977542.pdf
    • http://femaxewife.getenjoyment.net/47303313594.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/d42786a9-dac0-4d75-af45-a4e0fa9465b1/what_does_f_statistic_mean_in_regression.pdf
    • https://uploads.strikinglycdn.com/files/53b7ba8a-7505-4561-94db-9c97f5377ec8/because_of_mr_terupt_dra_level.pdf
    • https://uploads.strikinglycdn.com/files/c20ca23d-507d-4481-80b0-d55c75f9aa44/how_to_clean_keurig_needle_with_paper_clip.pdf
    • https://uploads.strikinglycdn.com/files/11ace703-24be-491b-8d06-44720ab75705/17966847884.pdf
    • https://uploads.strikinglycdn.com/files/27cf69fa-fd4e-4691-af4f-c0c69852990e/gukutipawukatukevozojibug.pdf
    • https://uploads.strikinglycdn.com/files/a9f5ede0-89a8-423d-b2fb-a3812ea991d1/9646373819.pdf
    • https://uploads.strikinglycdn.com/files/63273ea7-30db-404b-8549-586220b4546a/13626830386.pdf
    • http://poborunedajemo.onlinewebshop.net/automobile_body_parts.pdf
    • http://tipatanakuke.onlinewebshop.net/sosoleme.pdf
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_decfd1b299a949c6952bd23b89be36cf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9214b045-981a-4c42-afcc-bc4442924657/applied_calculus_6th_edition_hughes-hallett_free.pdf
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_29777652dde54c4781be78f76fa18c66.pdf?index=true
    • http://sovogezo.atwebpages.com/burareb.pdf
    • https://uploads.strikinglycdn.com/files/8a9ff902-a19c-43a7-b387-5151716db6d0/kikiwukozuzebuzebememumi.pdf
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_51b007277ad54f038a7cd1f4c4941112.pdf?index=true
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_85f382e1ecbb487d917109d475c89b71.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe30.bin
f5e87e962140149ae98f3f36b1a920b21603ba70de029a06cfc8596d7b045a1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 5128 bytes
font_01_sfnt_off00010fc0.bin
b28b147285c2045eb9e6ad25972ce8fd5a7af10044c998a6eddefb839c14930b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC0 11164 bytes
font_02_sfnt_off00013578.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13578 4324 bytes

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