Malicious PDF — malware analysis report

Static analysis result for SHA-256 517999350a480b53…

MALICIOUS

PDF

61.6 KB Created: 2020-12-05 18:58:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8a7506be5d40840e156da9d90c945d33 SHA-1: 79871ec664e65fcf0bb6bd94efadad065d3781a4 SHA-256: 517999350a480b5332b89e1e20ec7b4293c2f978ff47f392979d61e9b1193714
244 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to redirector infrastructure and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=california+sample+ballot+november+2018+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417418/normal_5fa18ab61b484.pdfIn PDF document text
    • https://folemazilepi.weebly.com/uploads/1/3/1/1/131164248/dujuzowuvezakaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375708/normal_5f8b30a4da29c.pdfIn PDF document text
    • https://peturenu.weebly.com/uploads/1/3/4/4/134401199/wubuvi_netejuveboruv_nadiwer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454820/normal_5fa605063f07f.pdfIn PDF document text
    • https://dezekebewefe.weebly.com/uploads/1/3/4/7/134731304/9934078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366666/normal_5fa1fdb174025.pdfIn PDF document text
    • https://sonujesenusa.weebly.com/uploads/1/3/4/3/134344018/pugoxasitedokifip.pdfIn PDF document text
    • https://gemitipob.weebly.com/uploads/1/3/4/4/134474898/xiwedifepux.pdfIn PDF document text
    • https://ziwavolenexajid.weebly.com/uploads/1/3/4/5/134503628/c461bab94.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wemazun/windows_10_pro_latest_version_1809.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/minecraft_pc_crafting_table_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c73f0405-baf0-4f7a-b116-f251304b2873/bomb_it_7_agame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc07a0f7-8287-4720-972f-7914d236a4e9/tiwezufovuxibemusoviwogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aafaed50-8443-4f02-86f3-56dbdc382038/55944938328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d2b96f5-0b08-4b5c-8b97-2517c1dd36a6/chain_reaction_word_game_puzzles.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_off0000b451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB451 5812 bytes
SHA-256: 625cf76786b04fca72e5bbe51378a2d83875bcd29c3c33b7352082e44deb3df5
font_01_sfnt_off0000c808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC808 9740 bytes
SHA-256: 3e58d44af31d4e290147b079f33d11b59847aae2a04e7578b73277279416b2e2

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