Malicious PDF — malware analysis report

Static analysis result for SHA-256 53102a8035eccb8b…

MALICIOUS

PDF

70.1 KB Created: 2021-03-17 11:40:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8b29e4338403d62ff8ff1deab902f62d SHA-1: c83cd9969b44ffb2216c10025756d948406b9741 SHA-256: 53102a8035eccb8b782a4aa6da741ce3c4793e89c47462f9b5ad48d655435412
186 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 large number of external links, many of which point to disposable domains or link farms, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this is a phishing or trojan distribution attempt. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious redirection, likely leveraging embedded JavaScript for obfuscation or execution.

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
  • 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.
  • 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://jacksth.ru/wix?keyword=mcpe+horror+maps+ios PDF link annotation
    • https://cdn.sqhk.co/sawijoturok/a5Jhj4B/7957395115.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/Ohhhhic/disneyland_resort_map_anaheim.pdfIn PDF document text
    • https://gitikaru.weebly.com/uploads/1/3/4/9/134901111/281319227ab1e.pdfIn PDF document text
    • https://lilepixot.weebly.com/uploads/1/3/4/4/134462463/6227630.pdfIn PDF document text
    • https://cdn.sqhk.co/jedelamodafa/egjdicX/43018598890.pdfIn PDF document text
    • https://cdn.sqhk.co/gewewoturila/hcUNhif/garageband_ios_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_075b4a64f90c444c98be4e6b0171ff7c.pdf?index=trueIn PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_f6a9a3f521234c76a7c5561567af3166.pdf?index=trueIn PDF document text
    • http://botogokobule.rf.gd/gmat_official_guide_2020_vk.pdfIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_14af00565b654432a6a1b39cfa031091.pdf?index=trueIn PDF document text
    • http://kevamateralo.rf.gd/dorexiladexofiragaf.pdfIn PDF document text
    • http://kosidigipetuvu.epizy.com/14640598352.pdfIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_601146fac1e348f88a4e481436b602ef.pdf?index=trueIn PDF document text
    • http://bojibag.epizy.com/72793226192.pdfIn PDF document text
    • http://jesebikalag.epizy.com/4444072993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d394a25f-d9d5-4075-9d6c-cead37897632/how_to_fill_a_ego-t_vape_pen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4a625d3-bc88-4477-bd10-ed4a339387de/blood_tests_during_pregnancy_third_trimester.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_off0000c8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AE 5144 bytes
SHA-256: ca4f89f0f7b48560e5d1d4ae7b6d1fb973684daaacf8de9ace7d9e3c40c8ebd6
font_01_sfnt_off0000da01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA01 4856 bytes
SHA-256: 301c7ea52eadfd54e16b96d43ce1dc9fc118eab3e3cd717ddb9e4a2c04623385
font_02_sfnt_off0000e729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE729 10512 bytes
SHA-256: 1c14d5245fb0c4e4e00f0bffea05d62aa0a51ac5387d6d2fd6da56a6d7ab0107

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