Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61db1fd71254ac1…

MALICIOUS

PDF

70.6 KB Created: 2021-03-24 23:57:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 39fbdc1d8ddaebbf81521684b9747855 SHA-1: 77de88eded29064d7d4ee655440c70b74d3dca03 SHA-256: e61db1fd71254ac15300767a06764827c48051b6909a7e7a2a7a6ef0c473c230
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document identified as malicious by multiple heuristics, including a critical finding for a link to known malicious redirector infrastructure. The document body contains garbled text, but the presence of numerous links to disposable domains and the ClamAV detection strongly suggest a phishing or malware distribution attempt. The ML classifier also provided a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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://crophysi.ru/strik?utm_term=calories+in+10+munchkins In PDF document text
    • http://jezakomesudo.22web.org/managing_oneself_peter_drucker_book.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/fotokomeduleg.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/s60_vs_s62_garmin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_6042c86a83e0b.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/gghfJGS/11991643015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408976/normal_6034cc0a6aeb9.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/vgifngf/minecraft_servers_survival_1._16._1.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/404hjjg/comedy_central_productions_logo_1999.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/lotibabakuj/historical_criticism_in_literature.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac817407-2760-4400-8070-5dfe87d053c9/19220830587.pdfIn PDF document text
    • http://rorokepu.atwebpages.com/pdf_to_word_converter_editing_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/691d615c-9fb1-4d03-a0bb-abd244d0fefc/frigidaire_refrigerator_parts_door_handle.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/mekikibanaxufaxukuzamaf.pdfIn PDF document text
    • http://finesegugumemo.epizy.com/the_walking_dead_comic_book_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9b3466a-2608-4dac-b4a5-5daa491eff60/steel_magnolias_movie_script.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/76185310970.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/44717909112.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FF 5200 bytes
SHA-256: 2cc6365103b5d28fc2acc9bcc7055f643466e3fd9ea755d9b53a0ae953676c11
font_01_sfnt_off0000e784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE784 10700 bytes
SHA-256: 105128d75056b160f38a9ce5880d271b1e463572e5368f2d760901eb7b02f1e4

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