Malicious PDF — malware analysis report

Static analysis result for SHA-256 5728c27e4f62a6de…

MALICIOUS

PDF

76.0 KB Created: 2021-02-17 02:49:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 8848d6bf1d7e3b7fd869d5499d566c2f SHA-1: d067d3fc36fb1126ee14840a1d3338bc84c7898d SHA-256: 5728c27e4f62a6dea2651e12be204006fac2aaec75373fd8b0019b22cd0cd940
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with several pointing to disposable hosting and employing UTM parameters, indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=big+mouth+and+ugly+girl+summary+chapter+16 PDF link annotation
    • http://alex-travel.moscow/tiwajerajaxarnrvkf.pdfIn PDF document text
    • http://poguferuliwu.iblogger.org/wuvagerurotirig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496597/normal_5ff2d796a4496.pdfIn PDF document text
    • http://ig-objectionform.com/kids_birthday_party_ideas_near_megmg7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418584/normal_6005ec0f16946.pdfIn PDF document text
    • http://ukranews.site/26071266290i6fxl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469374/normal_602b711b519d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419629/normal_5ff92992c984c.pdfIn PDF document text
    • http://watertea.space/448287786297n1o.pdfIn PDF document text
    • http://custits.space/zokasuragebexuxynrxr.pdfIn PDF document text
    • http://streichpack.online/55853544842arlep.pdfIn PDF document text
    • https://kuduxuke.weebly.com/uploads/1/3/5/3/135323303/3611174.pdfIn PDF document text
    • http://patewukezevo.iblogger.org/gb_whatsapp_beta_free.pdfIn PDF document text
    • http://instacopyrightcenter.com/93410491953hyfts.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/bokelur/lilies_of_the_valley_planting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/book_folding_template_maker.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/zijetozofalisolasa.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/5218217969.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_off0000eb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 5844 bytes
SHA-256: fd39d68dcd75b7bb5c5962cee1460fba538713089188466ad57e79f9ec0a9012
font_01_sfnt_off0000feed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEED 10504 bytes
SHA-256: e857ffa332c7ea83db3db35170566b29e70697114d899d442e315f23cfcfc3b2

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