Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd786e140ab9524…

MALICIOUS

PDF

67.5 KB Created: 2021-02-18 22:47:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9c39772da8f0c78e7d4f114b0f666b21 SHA-1: aa2eaaa6d797a8bae9674c10744179e1f8e80d49 SHA-256: bdd786e140ab95244c0cbe71ae538b2de54876f1be8cd42bb3bc80d99bffb232
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score support the classification as a phishing or malware distribution attempt.

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://druttle.ru/strik?utm_term=texas+a%2526m+engineering+average+starting+salary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457838/normal_5fd6688e6c71f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_5fd730639e4f4.pdfIn PDF document text
    • http://perevod24-card2card.site/4311995767ld4ue.pdfIn PDF document text
    • http://onsideball.info/bachelor_diploma_template1524g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452217/normal_6009f842412d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447253/normal_5feb165422e44.pdfIn PDF document text
    • http://xekinivafu.iblogger.org/animal_crossing_shampoodle_hair_guide.pdfIn PDF document text
    • http://fivabigenarewo.22web.org/malden_police_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454301/normal_600de63f35dac.pdfIn PDF document text
    • http://openchambre.xyz/xidadotuzixobagerikaowmj1.pdfIn PDF document text
    • http://ductsunlimitedins.com/gixilidaxijajowededakadcwy8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371787/normal_5fd2e49e97848.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kavotipuwevir.epizy.com/billennium_story.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/8067710238.pdfIn PDF document text
    • http://witolav.epizy.com/gangsta_s_paradise_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/cimb_group_annual_report_2017.pdfIn PDF document text
    • http://mowelafawugek.epizy.com/4_main_types_of_bacteria.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/49796612113.pdfIn PDF document text
    • http://nefaped.epizy.com/10461048395.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/biguf.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_off0000cdac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAC 4568 bytes
SHA-256: 0ac48b7fcd56fc0753490d5d1812b3ec9c2d5b034fdc3c23e36e9054e661f39b
font_01_sfnt_off0000dd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 10644 bytes
SHA-256: c1b7b5cbdcdb2c8ec90c3766cf61fca7e4196ae5215348f1aed3b0d5ebf1a127

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