Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3ca1560e457e8e…

MALICIOUS

PDF

134.5 KB Created: 2020-11-18 08:18:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 5993b28a438bce99a21a554f95932f74 SHA-1: d387686701af1130d7d52874fe6963167212d992 SHA-256: 5f3ca1560e457e8e2f1ae0a32bda88445f5b03bd8bfc40cf392cc5819c80a7f2
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, identified as a link farm, which are designed to redirect users to malicious sites. One such link points to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cctraff.ru/strik?utm_term=cs+lewis+books In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411919/normal_5fa5f04c1e9ad.pdfIn PDF document text
    • https://xaxexapiro.weebly.com/uploads/1/3/1/4/131453807/miwap.pdfIn PDF document text
    • https://xogofodaromaf.weebly.com/uploads/1/3/4/3/134387758/wajujakowibegajiguzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413474/normal_5fa6211053065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376874/normal_5fab4f1a239cf.pdfIn PDF document text
    • https://tusunupo.weebly.com/uploads/1/3/4/5/134507020/jexapuvegipijimubuf.pdfIn PDF document text
    • https://lebabipiw.weebly.com/uploads/1/3/0/9/130968925/5b7e7d0fbb8.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/55a240e5-c5c2-4461-944e-e1363e223f1c/fosepizajosijaziwanor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19a50e74-e3d5-4371-bd13-5beb2a052a3d/41252228569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5604c0ca-7362-4a5b-a7a3-c3a080ea88e0/norma_aashto_2002_en_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/1408850329.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f3ab33a-4103-45cb-89cf-629e44963b5b/12798900506.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/roblox_song_codes_rap_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/144759d6-e7d4-403b-b578-692c8a06794f/vopumofogutolew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90e28a9b-07b3-4c04-b417-3d7a9b007290/mujavi.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_off0001d648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D648 4576 bytes
SHA-256: 776788caba76969c3292406876a9c4e94d23b6d266baa72c325fca271c89a72f
font_01_sfnt_off0001e600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E600 11680 bytes
SHA-256: 714b2b217bff378fb71380f61e43fe1524aa343002f1b0019e1dfdfdd21c06a9

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