Malicious PDF — malware analysis report

Static analysis result for SHA-256 284ed6fdf01f641f…

MALICIOUS

PDF

89.6 KB Created: 2020-12-25 12:15:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: db0c500c73b8144e41dd72f563d6ac72 SHA-1: 76aa5e8794720edf0bf1a56fb147b5b720653f0d SHA-256: 284ed6fdf01f641fa5f5926a5c3926a154fbe66149617684bae2348f6acf8121
244 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs pointing to external PDF files, many hosted on disposable domains, suggesting a link farm or redirection scheme. One critical heuristic indicates a link to known malicious redirector infrastructure, further supporting a malicious purpose.

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://cctraff.ru/strik?utm_term=abandoned+mine+escape+room+ore+pass In PDF document text
    • https://cdn.sqhk.co/pupevadojas/jd2gjZ3/kujumorunewo.pdfIn PDF document text
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/lopekel_fotimijafitiv_gajuwarofijebod_gevilaxu.pdfIn PDF document text
    • https://pikupazu.weebly.com/uploads/1/3/4/5/134577858/pivegejimin.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxisilogok/ieAhaqj/mini_golf_in_montrose_co.pdfIn PDF document text
    • https://sivanijizifi.weebly.com/uploads/1/3/4/8/134848714/7674870.pdfIn PDF document text
    • https://soxajenukaru.weebly.com/uploads/1/3/0/8/130874283/jewakupudize.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/3gf3Uoz/digimon_virtual_pet_2020_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/lilanoto/jcjgeDu/befevo.pdfIn PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/7326fdda0f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373755/normal_5fcdb0ac3ea6c.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/99c230a9-81cd-4dc9-86c0-bdf000d83ddb/cars_2_putlocker.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/28345069720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f42b9612-f1fe-4ccd-b3f9-26839b1d8c47/venn_diagrams_probability_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/bee_eater_bird_information_in_marathi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10324 5316 bytes
SHA-256: aafaefc44cb77061ad5bf921aadf5e6d0bb09ed47d968c5f730e19ed768fda98
font_01_sfnt_off0001150f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150F 4520 bytes
SHA-256: 7349cb6fa6dca9a22694f898c0496c1153db73bad70e5ea201b4d81b51e0ea2c
font_02_sfnt_off0001215b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215B 10092 bytes
SHA-256: 78281e2207ee7d701c4c77eda49e4b90d136042cae90a06bbad35984d26a58ec
font_03_sfnt_off00014438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14438 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550