Malicious PDF — malware analysis report

Static analysis result for SHA-256 392d1c6bbd27c907…

MALICIOUS

PDF

92.0 KB Created: 2021-04-09 19:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f19c8b81e7ee5c100419007695d2197b SHA-1: e417f31294903438e9cef10b50424d49faafeb1f SHA-256: 392d1c6bbd27c9072a204533256363dbab7b9f93c9e063b059c3e0ad99405039
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to host many PDF files. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

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 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.
  • 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://ponafet.ru/strik?utm_term=rinnai+556f+parts+diagram PDF link annotation
    • https://fikuwigo.weebly.com/uploads/1/3/1/0/131071253/ganinopelivub.pdfIn PDF document text
    • http://opendouche.xyz/jukitezapob7vpk.pdfIn PDF document text
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/9b2ee663200f4d.pdfIn PDF document text
    • http://abzac.me/418886095257a11d.pdfIn PDF document text
    • http://idealslim-ordina.site/52237866718eei68.pdfIn PDF document text
    • https://ladozazewuse.weebly.com/uploads/1/3/4/0/134095850/gexubesuni-paxinonupimawu-ramulamoxob.pdfIn PDF document text
    • http://shoop-fm.ru/contoh_factual_report_text_tentang_hewanelz6w.pdfIn PDF document text
    • https://rigitugatelimo.weebly.com/uploads/1/3/4/1/134131632/zuwegimenokagose.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/bulujono/why_is_technology_important_in_education.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/79256451086.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/76115606807.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/gozojegoburixunavuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/rikok.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/canoscan_lide_210_drivers_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02fa5103-8e5b-4d23-ac14-9fc608d68215/either_or_a_fragment_of_life_by_soren_kierkegaard.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/icloud_contacts_in_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59c2b793-8b7d-4668-91e1-54a80923390c/2007_dodge_caliber_indicator_lights.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/heart_anatomy_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/solution_set_notation.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_off000124f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F8 5616 bytes
SHA-256: 47202c5d507c614622e10e5187aa4a3b24cc1e04488f17a0b9a4636980aa961e
font_01_sfnt_off00013806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13806 12324 bytes
SHA-256: ded19d1b20b32c3fc9396b5f2a27a7efec057df95c08fa768aaf91101a8a9441

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