Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f1cbafbd7a67ed…

MALICIOUS

PDF

74.0 KB Created: 2020-11-25 10:52:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 02a64bcb2d4d6ceba7e1f41d21913cc0 SHA-1: 7a1d637f49b027dfbbc6c6ffc5dffd82a9f6809e SHA-256: 87f1cbafbd7a67ed80e763e0849c2180afaa083d5da5ba7f3d55a2e26754fef0
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/123?utm_term=wow+classic+manual+crowd+pummeler In PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/caa64.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/a0048279-a453-4cd5-bf84-1975bf1705af/vemoduxul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd469446-2a85-4e4b-bee8-4719b19ef84c/minecraft_flat_world_seed.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/vuropizetonurenatesopami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e8b95e7-15a0-44c0-9221-b5f493fa1b61/1641244653.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/022e561e-f134-448a-875d-3ea17d6e7a87/ridopewiliwirebixumun.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/bsc_cbz_notes_1st_sem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9088cd76-63a5-4382-8211-201e7d103424/montgomery_ward_catalog_1895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/636109b4-67c7-4576-bce5-51fc83b9ac8f/19414314159.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21492e03-969d-46b6-bac2-c9fd12c5eac8/ligewafajaxabizumogafiji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ce7bba2-605d-4c57-aaae-3b0e0301af67/return_man_2_quarterback.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/7939514217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c742a8e-6e4d-47ce-840c-b08d461de28f/descargar_gta_san_andreas_para_android_mega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2a20b7f-bf6b-44f2-a0f6-b6346c314464/semagubepab.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_off0000e1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CB 5324 bytes
SHA-256: a8dd2507c2b4d62ff92a9410619d1554ec278a590af1a8ceed6e643f7ae3d11a
font_01_sfnt_off0000f3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E4 11612 bytes
SHA-256: f83782658920493a7249e32fb5108f492a7407b899243872469c6cf1857acbf6

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