Malicious PDF — malware analysis report

Static analysis result for SHA-256 88734e7bd69e9f7a…

MALICIOUS

PDF

81.9 KB Created: 2021-03-15 17:04:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 83fdd55604a2de8c3a9a55f6095c78cd SHA-1: d3a7f6b6db73ab793259b15ca6700e57d813bb9d SHA-256: 88734e7bd69e9f7af28eab3d97989cba514928165eef4a63bfa34f61da265dcb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

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
  • 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://maypoin.ru/123?utm_term=animal+crossing+new+leaf+amiibo PDF link annotation
    • https://dazomutatif.weebly.com/uploads/1/3/4/7/134729749/886fb5d179.pdfIn PDF document text
    • http://mmmuuuue.space/ashampoo_free_vs_pro8wb6i.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/gopunuxef.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/busilodazenuxuwegu.pdfIn PDF document text
    • http://ninuwekevap.scienceontheweb.net/maxumefademirilu.pdfIn PDF document text
    • http://jefuvumerusew.getenjoyment.net/63261337957.pdfIn PDF document text
    • http://minuzin.22web.org/zolizubutuzabagaloxuri.pdfIn PDF document text
    • https://dagakaxogofawi.weebly.com/uploads/1/3/4/6/134699425/xitifokuwo-leretowes-jasosi-fuvanugim.pdfIn PDF document text
    • https://kerejokav.weebly.com/uploads/1/3/1/6/131637695/7140041.pdfIn PDF document text
    • http://gojawufeki.getenjoyment.net/58030215570.pdfIn PDF document text
    • http://hookup673.site/14983195871nqt26.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/kubafezin/nazegibigivoderope.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/76451290553.pdfIn PDF document text
    • https://f9a132f0-acc9-4761-b7d8-38025aedd849.filesusr.com/ugd/5c71d6_8d341f6cea114304b29ece94f5dd5295.pdf?index=trueIn PDF document text
    • http://jemileti.atwebpages.com/porsche_993_buyers_guide.pdfIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_945cf60c8eee4f1c8b0628eda9c2723e.pdf?index=trueIn PDF document text
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_0f358bb82d0049a59a0fc8e4b3aedc36.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/25409364368.pdfIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_1768a946e76e44a9921bf4965bad1772.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/bee_gees_album_zip.pdfIn PDF document text
    • http://dejogamolefip.rf.gd/fobuda.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/8067092505.pdfIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_24f54f37c84f4195a910b811fc3f9b4f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBF 5500 bytes
SHA-256: a7742aa7ed7e6d7693bfc5e870a2bbd8a1deb58fa1dd6989e62e3e109558f79d
font_01_sfnt_off00010194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10194 5424 bytes
SHA-256: 593c5099c44c95804fb5c098b73e8d5f167a6ccbfc7b41e17a8a5f13a52eced4
font_02_sfnt_off000113fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FB 11120 bytes
SHA-256: f1bc7552fb932c074312540fb478bc82dc00b06a9dbf16cc98d82b7875569477

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