Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f59da457f698aaf…

MALICIOUS

PDF

93.5 KB Created: 2021-02-26 06:19:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b6c66b5ee33860d22a89c0894615434a SHA-1: 43ce25b9cd438bffd59e6dee6e171e61ee46da42 SHA-256: 0f59da457f698aaf1fc37b04ca2f2080f3884ac37acb3eb87ccf7a7c1a8f6686
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and the link farm heuristic point towards an attempt to redirect the user to potentially harmful 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://leonvi.ru/strik?utm_term=pioneer+deh-80prs+miglior+prezzo PDF link annotation
    • http://rm-swis-mine.com/3519173570ujfyd.pdfIn PDF document text
    • http://istlan.space/15376204172dbz9h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495846/normal_600f45f814cd4.pdfIn PDF document text
    • http://trokot-roznica.xyz/487992514640whut.pdfIn PDF document text
    • https://pigogiril.weebly.com/uploads/1/3/4/3/134397820/lejoda.pdfIn PDF document text
    • http://hrushch.space/3809234831rnpvl.pdfIn PDF document text
    • https://fujepibipaxider.weebly.com/uploads/1/3/1/0/131070521/8850719.pdfIn PDF document text
    • https://razosuxox.weebly.com/uploads/1/3/4/7/134719946/6906240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377407/normal_60249749a1a63.pdfIn PDF document text
    • http://zekabor.iblogger.org/subject_in_formal_letter_writing.pdfIn PDF document text
    • https://boxuxalido.weebly.com/uploads/1/3/0/8/130814411/7586551.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fixuzobimube.epizy.com/32337880650.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/breathing_guided_meditation.pdfIn PDF document text
    • http://fifomivosa.rf.gd/valencia_spain_food_guide.pdfIn PDF document text
    • http://nupopejif.epizy.com/are_dunkin_donuts_flavor_shots_keto_friendly.pdfIn PDF document text
    • http://borarujedumamut.epizy.com/64624689656.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/patujakubobuxijajavavi.pdfIn PDF document text
    • http://nukigusesirujop.epizy.com/wolf_handbook_2018.pdfIn PDF document text
    • http://moposafasamik.rf.gd/california_highway_patrol_citation_number.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_off000123d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D6 5584 bytes
SHA-256: 9d166311c77f8f21b020f4616063910efb2e3f26174b72fa8e5e859295cce160
font_01_sfnt_off000136b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B9 16080 bytes
SHA-256: 7d99c30372373e3ec1a896e57f9befff65363de9fe006ce64b8672199fc484fb

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