Malicious PDF — malware analysis report

Static analysis result for SHA-256 515ced7dea63e246…

MALICIOUS

PDF

58.7 KB Created: 2020-11-19 07:54:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e5bbfaa80418ca745aec5ac4f855d70b SHA-1: 9dc2c44e3056a33ace96a59edf8f1f88f45a27c6 SHA-256: 515ced7dea63e2465c5dcec13e4ac3b489c8fec0f4a0e7a7b521dd6ed1541aee
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links pointing to external PDF files hosted on various disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected the file as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was programmatically generated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffmen.ru/strik?utm_term=complete+sentence+worksheets+3rd+grade In PDF document text
    • https://rofuvawe.weebly.com/uploads/1/3/4/3/134363923/nodojujotiz.pdfIn PDF document text
    • https://fikazimibugexu.weebly.com/uploads/1/3/4/5/134515259/3769373.pdfIn PDF document text
    • https://tilejawerez.weebly.com/uploads/1/3/4/7/134709016/raximomuserawowerej.pdfIn PDF document text
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/5951249.pdfIn PDF document text
    • https://disavapiviloma.weebly.com/uploads/1/3/4/3/134351159/dee7198da788.pdfIn PDF document text
    • https://kabijefilomi.weebly.com/uploads/1/3/4/7/134761935/birilipitajosude.pdfIn PDF document text
    • https://beginuvemosuso.weebly.com/uploads/1/3/4/6/134699988/rapixujatedo.pdfIn PDF document text
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/2ebe75c835.pdfIn PDF document text
    • https://rapexinet.weebly.com/uploads/1/3/4/3/134328854/7286628.pdfIn PDF document text
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/nasileruwi_jebegunibigonir_vemusi.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/55c4932b-572a-4d28-999b-20b933a14cb9/10586978220.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/webubamijofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9164878-f51c-4b7c-80fe-6a520f48f277/93796704761.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_off0000aa16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA16 5712 bytes
SHA-256: 25b26110e2f962058406078e8fe650de13a9255bba4b2501a350114536e0df4c
font_01_sfnt_off0000bd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD68 9712 bytes
SHA-256: f6a690607f8b665a63e5465969ff81bf37adee0527785ed3020c2ad7b5a34f51

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