Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e14fa3b6da2913…

MALICIOUS

PDF

75.5 KB Created: 2021-03-15 07:16:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: d2d05fed0cc0377737cf45cf72cdc184 SHA-1: e9edab358ca35f1a84a380ebe9d70232553f8f26 SHA-256: 13e14fa3b6da29135ed7d5e0fbee9df8d44139c87d319156d252ce3140015e26
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a primary external URI pointing to 'https://gimoguvi.ru/strik?utm_term=define+news+literacy'. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and URL usage suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/strik?utm_term=define+news+literacy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465402/normal_60262a0c93325.pdfIn PDF document text
    • http://ig-copyrightviolation.com/21360045641qdrbh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459182/normal_5ff9f8b2eff1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413455/normal_6021edc7b62bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496402/normal_604a9d94ad54e.pdfIn PDF document text
    • http://believes.space/pawekibuxorvjfh8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485822/normal_5fdc30305f2fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491173/normal_5fed164ce488b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390659/normal_6011ac0c9af09.pdfIn PDF document text
    • https://gopaposoxawa.weebly.com/uploads/1/3/0/7/130740193/a170c76.pdfIn PDF document text
    • https://durosokikiw.weebly.com/uploads/1/3/1/3/131379956/e71737854.pdfIn PDF document text
    • https://todatotosikuped.weebly.com/uploads/1/3/0/7/130740429/7723322.pdfIn PDF document text
    • http://sexesex.site/xovanudilukazafudofubamual72p.pdfIn PDF document text
    • http://italiabeach.space/sinazazarumezedag0vu6d.pdfIn PDF document text
    • http://fenofaxizuva.22web.org/avg_cleaner_for_mac_free.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/jokotaziweluge/29333516112.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/nadujige.pdfIn PDF document text
    • http://wawanojuvib.rf.gd/cetyl_alcohol_msds.pdfIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/nopoxezawa.pdfIn PDF document text
    • http://wegarasuw.epizy.com/kidagidaxegamu.pdfIn PDF document text
    • http://bufarudewigufeb.rf.gd/cardiovascular_physiology_concepts_klabunde_free.pdfIn PDF document text
    • http://jujonejetas.epizy.com/business_plan_sample_kenya.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_off0000e9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EF 5068 bytes
SHA-256: 557e9b5169044955c99bbfc08dc2a481378aeb6156eacc81e737c1d2498d89b6
font_01_sfnt_off0000fb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 10536 bytes
SHA-256: 6dd011a4b7041d31881257bae02ca0680f2f2ee85aefef2ab8c7d915cd61117e

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