Malicious PDF — malware analysis report

Static analysis result for SHA-256 55062b6d5f8ee47b…

MALICIOUS

PDF

76.7 KB Created: 2021-02-26 11:27:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 0e09cc45db7787a1fbc8601a8ac1d846 SHA-1: 804b0a24f7a7d1237589c24e7fb16dbf35cbdd31 SHA-256: 55062b6d5f8ee47b2ee6c9f88069b30688ef9cac2b500d3ad8cffc6639fdc6d1
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs, such as 'https://xezojetit.ru/strik?utm_term=american+literature+authors+timeline', suggest a phishing or malware distribution attempt disguised as a benign document. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards malicious intent.

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://xezojetit.ru/strik?utm_term=american+literature+authors+timeline PDF link annotation
    • https://wesoxiworikezux.weebly.com/uploads/1/3/1/3/131380467/sekewidowa.pdfIn PDF document text
    • http://italdom.fun/tupelakisomamonawymn3r.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/wetiwexuvizilixitul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389793/normal_5fff43d2032e1.pdfIn PDF document text
    • http://ipoteka.net/wizomevotafeplo1y7.pdfIn PDF document text
    • http://forpost-electrica.ru/zonetatukubemogisupituobwt.pdfIn PDF document text
    • https://toxoladosa.weebly.com/uploads/1/3/4/4/134479392/sugelinij-jewigegu-sifuxiwodimof.pdfIn PDF document text
    • http://puwonasomoso.22web.org/gojosekewubojetev.pdfIn PDF document text
    • http://levelupguild.com/29797610915c7i8f.pdfIn PDF document text
    • https://neveloso.weebly.com/uploads/1/3/1/4/131408616/2573049.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wowidetijajed.epizy.com/87694888956.pdfIn PDF document text
    • http://vewesefidovif.epizy.com/sbi_unnati_credit_card_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/fizik_bicycle_shoe_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/86221839633.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/90395125551.pdfIn PDF document text
    • http://jafutalamisa.rf.gd/aramusha_guide_fr.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_off0000effb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 5028 bytes
SHA-256: 3bda15f1b8640c875639a1b17fa41581afd91b789c8954590e762caa51671bf4
font_01_sfnt_off000100e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E0 10808 bytes
SHA-256: 9e0e240bfa4ce608a9db0d25ada998fa4d9da639933a259d471ecb6b1238dd5e

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