Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76a084b4db55a13…

MALICIOUS

PDF

65.8 KB Created: 2020-11-14 03:55:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 1efcb2d39e52966fd57fc83ca89f0eed SHA-1: 00653b17329e51bb14ed0980d92f92686f8951e9 SHA-256: e76a084b4db55a138cc65012a5e3c033f7ea25d8d02bf6f07a4a67d8bbccb476
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection, potentially leading to a second-stage payload or credential harvesting.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=nova+fireworks+video+worksheet+answers In PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/fabf5383a5d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384652/normal_5f8ce3f49f262.pdfIn PDF document text
    • https://vepezifu.weebly.com/uploads/1/3/4/2/134265798/dukejukojunase.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462678/normal_5faa64570fc57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403404/normal_5f9809cf56e41.pdfIn PDF document text
    • https://bekijarodik.weebly.com/uploads/1/3/4/6/134617997/litamagul.pdfIn PDF document text
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/5b8bf3948c1e.pdfIn PDF document text
    • https://fepavibubezi.weebly.com/uploads/1/3/4/6/134611462/subodugizoj-jatonutakonozuf.pdfIn PDF document text
    • https://lufavipipoj.weebly.com/uploads/1/3/4/5/134580953/kilepogu.pdfIn PDF document text
    • https://kugakisan.weebly.com/uploads/1/3/4/3/134390280/mudunu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/df78adc3-d1c8-4549-8d22-d44a4cec30a2/comparative_and_superlative_adverbs.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/84534851781.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_off0000c410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC410 5148 bytes
SHA-256: da3244d9eb860186cb5e401a4f59419ae29ae059360b4bf0809369f8e2aedccc
font_01_sfnt_off0000d5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AE 10740 bytes
SHA-256: e0bc6c6ef446445b6e2b77c29b47fafad47cdd2890324c313ce677d7e83652e9

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