Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53c65acd8d51c8a…

MALICIOUS

PDF

86.0 KB Created: 2021-03-12 12:43:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: b69c7628262deaa02296992da4556654 SHA-1: 7908b45551d7c974b45a20229c0e8f0f43f5dcdf SHA-256: e53c65acd8d51c8accfe2538d2c4b139c8af9a63c43a1d8081b9ab02e538e35a
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, embedding numerous external URLs, many of which are hosted on disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The presence of external URIs and the overall structure point towards a phishing or traffic-driving scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/award?keyword=bearing+block+types+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4502436/normal_603e2b19954a9.pdfIn PDF document text
    • https://nowagomasililub.weebly.com/uploads/1/3/0/7/130775830/0f237bff2f.pdfIn PDF document text
    • https://zovotinaselon.weebly.com/uploads/1/3/4/5/134589175/3417520.pdfIn PDF document text
    • http://vaxiliwu.medianewsonline.com/hernia_umbilical_en_neonatos.pdfIn PDF document text
    • http://rentline.pro/do_you_need_math_in_businessck8ex.pdfIn PDF document text
    • http://mujododaziwato.scienceontheweb.net/fopamuginusugulidav.pdfIn PDF document text
    • https://niwejipudid.weebly.com/uploads/1/3/5/3/135383293/adcd5de4ba1103.pdfIn PDF document text
    • http://mavpa.fun/how_to_use_simplex_method_in_linear_programminguaksy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420906/normal_5fca063b6e649.pdfIn PDF document text
    • http://pusewuvi.medianewsonline.com/58145100547.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446638/normal_5ffe82cbd6ac5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484115/normal_5ffbd33566315.pdfIn PDF document text
    • http://terunokunojusa.22web.org/assertiveness_test.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://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_ab0e3faca9d448338a0879821f82f4c7.pdf?index=trueIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_1acc63c2224f464d87531533194f51f3.pdf?index=trueIn PDF document text
    • http://gapoxuvopa.onlinewebshop.net/93147354738.pdfIn PDF document text
    • http://repajazofuwide.epizy.com/abbyy_finereader_free_softonic.pdfIn PDF document text
    • http://nununad.myartsonline.com/what_are_the_small_indentations_on_a_golf_ball_called.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
    • 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_off0000f08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08B 5468 bytes
SHA-256: 9621ea69f4d0f236cd05262a5b6ac295d94a6ccd75fd2e47a5c8f3925e6365e8
font_01_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 9972 bytes
SHA-256: 7a1a79a16ab2de0638707f47fe20735962d02ab7a78274186d7c5140e848eec1
font_02_sfnt_off00012592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12592 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6
font_03_sfnt_off00013aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA9 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34