Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd705fcbf34adf6…

MALICIOUS

PDF

78.6 KB Created: 2021-03-09 13:07:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a9fee73aeb3ea885b8c999f3c70f83f7 SHA-1: e38afaf8e5b1790c36e7dbd59f2f67ac02b8b00b SHA-256: 4bd705fcbf34adf6e02fecdc352da17ba140a8ad2497e5a4000c84fa38b3e2ab
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of embedded URLs and the heuristic indicating a link farm on disposable hosting suggest an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/award?keyword=bibliografia+normas+apa+para+pdf PDF link annotation
    • http://xelinuruziv.iblogger.org/45118101974.pdfIn PDF document text
    • http://madamzero.com/what_is_hearts_of_iron_42a0es.pdfIn PDF document text
    • http://mazers.fun/76872559291i3mtm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417318/normal_601846368b5b5.pdfIn PDF document text
    • https://lovelutunaguj.weebly.com/uploads/1/3/4/7/134735325/3932758.pdfIn PDF document text
    • http://dle-tpl.site/25523789621baql3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409248/normal_6007d042b46f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421788/normal_600961b9dd67a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_6013ba04e4e39.pdfIn PDF document text
    • https://mazegiwekode.weebly.com/uploads/1/3/4/5/134529082/dijofupatobagi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458829/normal_601778c483e9f.pdfIn PDF document text
    • http://wuwisometojone.66ghz.com/soundtrack_drama_korea_hotel_del_luna.pdfIn PDF document text
    • https://ninafaguri.weebly.com/uploads/1/3/4/5/134592808/3696503.pdfIn PDF document text
    • http://glawerry.online/kujowscrtp.pdfIn PDF document text
    • http://dorightschool.com/46897615386kz4gm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://palakojum.rf.gd/letter_of_recommendation_template_for_teaching_job.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/941cc289-3470-4b0e-b40d-e93e9d6843a7/jikojaputo.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/zufaku.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/zusolirika.pdfIn PDF document text
    • http://sidakofonol.epizy.com/wesimowoxejafan.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/absceso_hepatico_elsevier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91ed2076-a41d-4487-b087-1d89b2644a3e/adobe_premiere_pro_cc_2017_free_download_softonic_crack.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.

FilenameKindSourceSize
font_00_sfnt_off0000f1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 5552 bytes
SHA-256: 4369005863df1a546b6a1a364618d0d7f1d09b00d732c25c69cf838ebe871b81
font_01_sfnt_off000104b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 12756 bytes
SHA-256: 6a5cfbbadc246a20a2122cee400748077324c60d3c454418b05c25f4377c3e7e

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