Malicious PDF — malware analysis report

Static analysis result for SHA-256 a282dd0b61a8b413…

MALICIOUS

PDF

81.3 KB Created: 2021-03-04 06:56:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b2e3ebc4c16fa0b8ceef91c90c1b701e SHA-1: 8a539677bde592102a485db1a75d98e218d90c7c SHA-256: a282dd0b61a8b4131a34924435008909e3039c5c5caf5b79936a642bdf2fa697
184 Risk Score

Malware Insights

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

This PDF file exhibits malicious behavior by embedding numerous links that redirect to potentially harmful content, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection further support its malicious nature. The embedded URLs and the structure of the PDF suggest an attempt to lure users to malicious sites, likely for phishing or malware distribution.

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
  • 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=is+the+movie+little+boy+based+on+a+true+story In PDF document text
    • http://everydays.space/41948415862hm542.pdfIn PDF document text
    • https://karivimefoga.weebly.com/uploads/1/3/4/3/134311068/8492270.pdfIn PDF document text
    • http://hightrade.club/jewuwogill6d68.pdfIn PDF document text
    • https://sotumeramevoma.weebly.com/uploads/1/3/0/9/130969712/xoxem-niganedis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454672/normal_602fc8a6f1497.pdfIn PDF document text
    • http://ductsunlimitedins.com/vajiteposevjt88.pdfIn PDF document text
    • http://sesulup.iblogger.org/area_and_perimeter_of_triangles_worksheet_tes.pdfIn PDF document text
    • https://voxonororipesap.weebly.com/uploads/1/3/5/3/135383222/zonejepekosutuzax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446259/normal_5fff35d91d04f.pdfIn PDF document text
    • http://kraftmann.su/telelajutuwimulirufililqmvb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sujonereduvuk.rf.gd/copied_factory_ffxiv_guide.pdfIn PDF document text
    • http://sofugudoz.rf.gd/bs_helper_tool.pdfIn PDF document text
    • http://jekowatu.epizy.com/64599274445.pdfIn PDF document text
    • http://sujidise.epizy.com/food_rules_michael_pollan_summary.pdfIn PDF document text
    • http://pajofaliwiwa.rf.gd/xudusanojinozinaviwamaban.pdfIn PDF document text
    • http://votenumilo.rf.gd/types_of_non_arguments_with_examples.pdfIn PDF document text
    • http://lekowezitodog.rf.gd/catalogue_oriflame_2018.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_off0000f263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 4088 bytes
SHA-256: 5af49dc7d2e5bc66a9db0323ffde8832fedcf4185125d8f773e8bdfe4d581693
font_01_sfnt_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 5304 bytes
SHA-256: a2096f17de5a46f55bb1e969f3d8240e708e66751082529f67791a8990a24f16
font_02_sfnt_off000112b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B1 10620 bytes
SHA-256: 58fed062de8d27431135424c5baed6e3ac839d8de24c2780ac13f4e65e8dac4e

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