Malicious PDF — malware analysis report

Static analysis result for SHA-256 537d4ae0501c7075…

MALICIOUS

PDF

70.0 KB Created: 2021-02-17 22:59:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 72a97d530896e48c90455d4fd39e1711 SHA-1: 9d6b35a0bbad42ca83b1e0f3fc45a9dcc6505c01 SHA-256: 537d4ae0501c7075c2de602311a27d16517804428434d0cefa4eafc125f12100
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL leading to a suspicious domain that appears to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

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://maypoin.ru/123?utm_term=star+wars+character+encyclopedia+online PDF link annotation
    • http://logoped-samara.ru/runupopovut6br6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488339/normal_5feb190db5a23.pdfIn PDF document text
    • http://nedosako.iblogger.org/derijelidip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413455/normal_6021a004563e1.pdfIn PDF document text
    • http://kogiwonewaveg.iblogger.org/zovutokapuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480173/normal_5ff456642d102.pdfIn PDF document text
    • http://dafujopinax.22web.org/lisiwus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425492/normal_60178b3d1de35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445739/normal_5fcd8d8b5647e.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/ruzaganog/ieefa_report_coal.pdfIn PDF document text
    • http://fixufesasuz.epizy.com/bopumafotajezisinaf.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/wuvujofuvonu.pdfIn PDF document text
    • http://zoxokukazo.epizy.com/articulate_storyline_quiz_template.pdfIn PDF document text
    • http://vekejikusuvi.epizy.com/59275447594.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/dawagugimejow.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/makeup_games_free_full_version.pdfIn PDF document text
    • http://tubafuwasaxa.epizy.com/c_programming_algorithm.pdfIn PDF document text
    • http://botamokawafaj.epizy.com/64895591502.pdfIn PDF document text
    • http://julizut.rf.gd/58353903520.pdfIn PDF document text
    • http://potolonufe.epizy.com/tamil_news_paper_link.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_off0000d46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46D 5460 bytes
SHA-256: 2b1fa45c3765a75c67aed469da228b669e517c61b0c484fff36a0bdf62ec4669
font_01_sfnt_off0000e712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE712 10544 bytes
SHA-256: abaf75168208d40f992799e3a81f5d75bfff4795398a81f6545cf9f88c16a121

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