Malicious PDF — malware analysis report

Static analysis result for SHA-256 3787cabf5ccc00ad…

MALICIOUS

PDF

71.4 KB Created: 2020-11-11 00:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bfb391757b5a35afad592de329a51d01 SHA-1: 9e35722c222edbd06dc61c9556c390d5235f2939 SHA-256: 3787cabf5ccc00ada830a013d2f9a5c055e020ccb5013fbbc0de7d39b47fd939
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it is part of a link farm designed to manipulate search engine results. It embeds a URL that appears to be a search query, likely intended to trick users into clicking through to a malicious site. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it is a phishing or trojan delivery mechanism.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/strik?keyword=grillo+food+++services+blaine PDF link annotation
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/pajokoruzerilu.pdfIn PDF document text
    • https://sakeneri.weebly.com/uploads/1/3/4/3/134339958/3c6a333e3e3807.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/16b66bbc-9629-4940-b181-98207adbe7a0/bizerba_scale_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0104dee-8134-43df-8e3f-0c6a71826513/xosulazojarubezesopi.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/ansi_c_book_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36bcb280-377a-4ffa-b0d1-c71d2bf8dc42/19712140037.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/tsunami_warning_for_washington_state_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e59ed77-01d3-45d2-a6e1-6c67da98a35a/vigozof.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/folasebatudesiwixidupid.pdfIn PDF document text
    • https://s3.amazonaws.com/suzitivasekoga/rotapugexajasomozumogiluz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8146fe1-40a2-42d4-b9d8-58674c400aed/faguderosinukelez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1d92f5e-b053-4173-a88d-68865cecde60/statesville_nc_gander_mountain_flag.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/algorithme_et_programmation_c.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/vufulus.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/7963785045.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD93 4956 bytes
SHA-256: a5b03a9b128689cec7734dbcc988ae39dd23e248ee4a4d9ef9a01eed1ac28818
font_01_sfnt_off0000de7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7B 10640 bytes
SHA-256: d44bf7d253b451b7926bd321e9a651baba00ce982dfbc39a4b0d7f8c79a114e2
font_02_sfnt_off000102a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A4 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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