Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7db7bb69c016a6…

MALICIOUS

PDF

74.7 KB Created: 2020-12-28 13:47:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 4df57c4b307b02651d23677c6c762793 SHA-1: 171bac8105e4fba34f5b08f8f714f71aad952ed7 SHA-256: ca7db7bb69c016a6827ed8ff89e4628b52d8f57042b50de7c1c35f48d6b47ebf
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the link farm heuristic is sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/123?utm_term=99+miata+engine+bay+diagram In PDF document text
    • https://rovatelafewi.weebly.com/uploads/1/3/4/3/134392743/rasefakatida.pdfIn PDF document text
    • https://karozazosepi.weebly.com/uploads/1/3/4/3/134316788/gosalipiwolo.pdfIn PDF document text
    • https://kuvinonufero.weebly.com/uploads/1/3/4/3/134307364/56652cc21ffe6ad.pdfIn PDF document text
    • https://cdn.sqhk.co/munemuzabuk/hacMifT/1362590710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368740/normal_5f87eb227554b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368226/normal_5f8e956aab803.pdfIn PDF document text
    • https://vutefurawo.weebly.com/uploads/1/3/4/4/134471077/e577bd84a8968d.pdfIn PDF document text
    • https://cdn.sqhk.co/menigopas/bhfjVsl/instagram_follower_count_tracker_over_time.pdfIn PDF document text
    • https://zipuwuxa.weebly.com/uploads/1/3/4/3/134376087/gilobobid.pdfIn PDF document text
    • https://jitoxegewizo.weebly.com/uploads/1/3/4/4/134460998/wutepifosinafu.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/pevuwarobuvowa/3539265595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8749303-0a5b-4cd4-b977-a7c28db377ad/lake_camanche_south_shore_marina.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/parkinsons_home_exercise_program.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_off0000e738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE738 5236 bytes
SHA-256: 76da7a408f4de5e0959831ecfcb4777335263b0bff968262a8e57579ccae6ac3
font_01_sfnt_off0000f8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 10900 bytes
SHA-256: 9d5ba94c375800426906a5f64b8864c1718d1869069103375bc8d83a1e620a85

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