Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec05bcda88c7d1e0…

MALICIOUS

PDF

88.1 KB Created: 2021-03-24 18:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a8a642e7fc4b942c89bcda9a82194dc9 SHA-1: ebf3ad036bec10818ce3b131f7abf030c9728ca7 SHA-256: ec05bcda88c7d1e0ea86e3b42e172f2bafbef1479f1a8c24d2040ebe4d1be0eb
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of 'utm_term' in one of the URLs indicates a tracking mechanism, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=nikon+prostaff+rimfire+ii+3-9x40+bdc150+walmart PDF link annotation
    • http://pochta-24.cc/319345812008x046.pdfIn PDF document text
    • http://freshmind.net/2004e14y2.pdfIn PDF document text
    • http://muldwych.com/1_11_4_pulgadas_a_milimetrosyykn0.pdfIn PDF document text
    • http://glossywp.online/lenafivabamowivenufawugan1xhd.pdfIn PDF document text
    • http://lynciguest.com/100_aos_de_soledad_pelicula_netflix77ini.pdfIn PDF document text
    • http://huaweistoreukr.xyz/shadowrun_20th_anniversary_edition3k94b.pdfIn PDF document text
    • http://trokot-shopnew.online/bewurubugosuzimodegexo862tx.pdfIn PDF document text
    • http://italywow.info/73774741950mi9lk.pdfIn PDF document text
    • http://my-favshopd.online/positive_thinking_definition_in_hindic1x33.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://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_2b2af65a0d054dcb803754ebcfca9f0d.pdf?index=trueIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_3ad4369f93154c9480874eef156bae25.pdf?index=trueIn PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_8441cb936d4a466fbb6946cfabc3b6d1.pdf?index=trueIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_3f78914dd4ca414fa48e6eee65fdb1e7.pdf?index=trueIn PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_e4f29ef352c14762a847f60fac854aaa.pdf?index=trueIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_2dbb721a064241e880f591a82501eb05.pdf?index=trueIn PDF document text
    • https://1a73feee-b327-4bc5-ac54-9d367b44a425.filesusr.com/ugd/226baa_1238304f85594aadad6676a7931d0441.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3eb1edf-e09e-4e1a-ad02-b8a2a325b160/dell_precision_m4500_core_i7_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aa595b4-5324-4aec-a719-c6bc5bef649a/28420462083.pdfIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_ff72c1a34c824aa58c9eb7fa9e32ef03.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE985 6180 bytes
SHA-256: 2674968d851c1b9db60207e66ee6a72e3bb335af2a22de41441774686423377f
font_01_sfnt_off0000fe89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE89 12240 bytes
SHA-256: 1048ec7b296d59e5943a0a89f2c16d9a22fc6006d4232fd5f667cab087020ac5
font_02_sfnt_off0001279e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279E 17772 bytes
SHA-256: 3f457db9e399d3b5ad894c2963575d9df9aa890896f98d22ee0f09edbf0045d1
font_03_sfnt_off0001429b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1429B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

Open this report in the interactive analyzer, or submit your own file for analysis.