Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc232c20f22dbb4…

MALICIOUS

PDF

88.3 KB Created: 2021-03-16 05:41:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d594b9809a96fd2a5a0dcc338ffdbccd SHA-1: 11c2e00880d842aac80962ea0fbb73e06604fa79 SHA-256: ebc232c20f22dbb4bea9e854cd20dd9eb6a855b22657d42e80cafc1e45579a74
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or redirection attack, likely initiated via spearphishing attachment.

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://vilenefex.ru/123?utm_term=rpg+online+android+ringan PDF link annotation
    • https://malosopiwa.weebly.com/uploads/1/3/2/6/132695478/1bb6e73c03ea811.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449996/normal_6032cc5be4cfc.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/e5AeuZ4/jaxomisufubogamun.pdfIn PDF document text
    • https://zeloseko.weebly.com/uploads/1/3/1/1/131163733/vupekapofimifedevala.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447436/normal_5fe3b2732b3ef.pdfIn PDF document text
    • https://wemakevarovafa.weebly.com/uploads/1/3/4/6/134636541/922f3354c8c.pdfIn PDF document text
    • https://gomopurijovovuj.weebly.com/uploads/1/3/5/3/135390772/9221eb918d98173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5fd61e630ef04.pdfIn PDF document text
    • https://novunafa.weebly.com/uploads/1/3/1/3/131379228/biviloror-sesaj-givixodon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372373/normal_5fff92b5859d9.pdfIn PDF document text
    • https://natumelazorog.weebly.com/uploads/1/3/4/7/134711419/2663584.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/IWVL6id/68385632393.pdfIn PDF document text
    • https://cdn.sqhk.co/nigulavax/ig8IZHQ/lighthouse_beach_seal_rocks_shark_attack.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_4e55e20d46be439292c937fa62eaa481.pdf?index=trueIn PDF document text
    • http://sidakofonol.epizy.com/canadian_passport_application_child_form.pdfIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_f7f1d2bfbea04e0f955134dad836d344.pdf?index=trueIn PDF document text
    • http://xekokopadupino.rf.gd/riporuj.pdfIn PDF document text
    • http://jumirasex.epizy.com/wedding_card_template_word_free.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_off00011019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11019 4956 bytes
SHA-256: 2ec5fa8a3c54de78d35b5148680c8467cf8e6464512a0ff161ab23f7a41cf3ce
font_01_sfnt_off00012107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12107 22964 bytes
SHA-256: fee765159d867a3b7872673f2bfbe83d3ec052d3f46f3936e92e745de6bc9925

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