Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5518c118605cb6…

MALICIOUS

PDF

97.5 KB Created: 2021-03-22 02:19:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 645e62bb6aada05edea88084a2f709c8 SHA-1: aa6c9e2238dc587eb88d5f046af4ec00f7e532f8 SHA-256: 9d5518c118605cb60e73f221eec306427df5722299040c1e04a29165640f90bc
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation attempt. ClamAV and ML classifiers identified the PDF as malicious, specifically flagging it as Pdf.Phishing.Trojan. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/123?utm_term=drupal+8+commerce+reports PDF link annotation
    • https://nutofagefisamav.weebly.com/uploads/1/3/5/9/135992035/gezubawigipolirow.pdfIn PDF document text
    • https://mizewipexu.weebly.com/uploads/1/3/4/6/134609608/3680379.pdfIn PDF document text
    • https://wunaramalus.weebly.com/uploads/1/3/4/5/134576193/6116583.pdfIn PDF document text
    • https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/2498f8475177.pdfIn PDF document text
    • https://fazajamol.weebly.com/uploads/1/3/2/7/132740605/5000685.pdfIn PDF document text
    • https://waporutonopira.weebly.com/uploads/1/3/1/4/131438234/polaju_pafizekobotu_wopamakuvofof.pdfIn PDF document text
    • https://zapojejomelaxi.weebly.com/uploads/1/3/0/7/130775516/vedomebewutaromi.pdfIn PDF document text
    • http://beteziraz.22web.org/baduwuretibovimubajosolof.pdfIn PDF document text
    • https://gubagomokugexat.weebly.com/uploads/1/3/3/9/133988684/999955377dfc9ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_a2ed1ecfd3bd426b98b09da61101913a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0fb9383-970a-47ac-97b8-c268ed45784a/los_100_verbos_regulares_mas_usados_en_ingles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/183fdb03-3131-41f9-9012-adffa335462e/fabozzi_fixed_income_securities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88bd2a72-512a-42cf-9be1-8b425b7fce20/ruvubaxipasexozejiwoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54d179b6-5462-4b8d-9e67-b1a48d4d3e11/13527374432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f62fcce9-dac0-4b8f-9ed1-355fe6a47b47/lavapaxotopirifizuji.pdfIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_8adce783249f454e9a3bcda881b049d1.pdf?index=trueIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_7743a57bd8384091b71fc7f32bd6ee45.pdf?index=trueIn PDF document text
    • http://jotigosi.epizy.com/missguided_bump_baby_box.pdfIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_a2de25a6949a4c6b99d0ca2d0efc9f26.pdf?index=trueIn PDF document text
    • http://wevikokuzufos.epizy.com/libro_tontos_de_capirote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b235f950-b9c4-4336-85e4-aaa49633c86d/zifafigumi.pdfIn PDF document text
    • https://fb3efafe-1b0e-41a1-9434-8bf556110c4a.filesusr.com/ugd/de5e41_eeb7c8d35a0d4c68943a28df5eca5851.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/16db9a7d-9981-43f4-b4f9-3938a70d4e9f/witcher_3_ps4_walkthrough.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1b598e3-418b-41ca-b586-9a27302455e6/94148145503.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96844d42-8b39-42b0-a707-b9e261f81d61/58348329678.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_off0001420f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1420F 5272 bytes
SHA-256: 0029eec10ab5a58fdfe3d9b1e193f6f503be112cd8696bccf29d40d5b9f7dc8e
font_01_sfnt_off000153e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153E5 10816 bytes
SHA-256: 0ad94e18963db96e08c6b90f5bd6bff3a90aa7ca3e2393ad2c4e56c355660751