Malicious PDF — malware analysis report

Static analysis result for SHA-256 78adb7f1422e8e37…

MALICIOUS

PDF

75.0 KB Created: 2021-02-17 21:23:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 48eefe9dc3ad179e62f5d5a75e51e8ee SHA-1: e2f0b956c42529f83a5fc0ef4d12ba743b13fed2 SHA-256: 78adb7f1422e8e373f9a521833b8dc69e68f4a18bfc2a13a481fb95f10ee98f5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URIs and the PDF structure itself are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/aws?utm_term=contrase%25C3%25B1a+router+technicolor+tc8305c+une PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453907/normal_600749f268518.pdfIn PDF document text
    • http://bcipreactivaperu.com/play_free_casino_games_no_downloadhi44h.pdfIn PDF document text
    • http://businessoutsourcing.info/83558810399b1g8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406191/normal_5ffc20195964b.pdfIn PDF document text
    • https://gisunotagalaros.weebly.com/uploads/1/3/2/3/132303086/e6593.pdfIn PDF document text
    • https://noxajigaja.weebly.com/uploads/1/3/4/6/134698193/9380206.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369163/normal_601b0715a9714.pdfIn PDF document text
    • http://penaleduduzib.iblogger.org/alexa_echo_dot_app_android.pdfIn PDF document text
    • https://jagotizepevex.weebly.com/uploads/1/3/4/4/134464701/5625964.pdfIn PDF document text
    • https://nupinegudoxaxu.weebly.com/uploads/1/3/5/3/135350485/livonewupofikuzut.pdfIn PDF document text
    • https://lumejukotexute.weebly.com/uploads/1/3/1/1/131163930/9736934.pdfIn PDF document text
    • http://idealica-co.site/avant_browser_for_mac_free6g85u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://femodizabofowu.epizy.com/cigarette_daydreams_sheet_music_guitar.pdfIn PDF document text
    • http://joxumokuri.epizy.com/hilding_anders_financial_report.pdfIn PDF document text
    • http://sarirepenibe.epizy.com/16121640903.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_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 5628 bytes
SHA-256: 498e9784a885131ca336b46776cbcbef247225297ba930818b1f0547bbfa33f0
font_01_sfnt_off0000f742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF742 10808 bytes
SHA-256: 8d5030833e9f99ecb0e088666f74fbd226e4bc1c793afce357d12ecd3be929a8

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