Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c58fd5c032d2d4c…

MALICIOUS

PDF

72.7 KB Created: 2020-11-23 02:23:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f9c10309bde7d493e5d4b58892fff7df SHA-1: 59ab68f68ffb006a4690018cce4b4dbccecc49f4 SHA-256: 1c58fd5c032d2d4c23b2c328cd866a06745cde0f16afec81b5d1d6ff94251f38
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The file contains a large number of embedded links, many pointing to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary IOCs is a URL pointing to a known malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://traffking.ru/123?utm_term=chicco+viaro+stroller+black In PDF document text
    • https://joxetoxuluf.weebly.com/uploads/1/3/4/3/134391367/34c7a8d.pdfIn PDF document text
    • https://dokakida.weebly.com/uploads/1/3/1/3/131380589/cdd1465cd2a15.pdfIn PDF document text
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/gezotuluxe_vadozixa.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/dbb1c40c-b852-4174-ab05-3f52acafdfd9/57737757634.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/unkilled_apk_offline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef0df2e9-572c-42b8-b297-d7cd6a9bd447/wizulenudofose.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/c3_and_c4_plants_difference.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/pomuzevabifulo.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/fetisifov.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/5498129736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e2864eb-e46c-4a50-bf8b-9383afef5ed2/josaratonusovejeduxipurez.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/43780051246.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/20530059111.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_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 5056 bytes
SHA-256: 5f007726e0ab0b965682211bf41e6c8a8c836964fedae4c3d97e4d4d0be670f8
font_01_sfnt_off0000f234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF234 10544 bytes
SHA-256: d3abf9d9e906c11587703d16772511265348d995a1a951d21438694fefd7f579

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