Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ebf754c5364aa7…

MALICIOUS

PDF

72.4 KB Created: 2021-02-28 18:48:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 12f47a4b35dc056dbc206a16790748cc SHA-1: 9acad3e84b4074a74d012d92fc569facacadb0d1 SHA-256: 63ebf754c5364aa79385c74d17c867819bbf1ddf37692543903910b4927808dd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, with several pointing to known malicious redirector infrastructure. The heuristic firings indicate this PDF is designed as a link farm on disposable hosting, likely to phish for user credentials or distribute further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=what+is+the+role+of+a+guardian+ad+litem+in+ohio In PDF document text
    • http://bajexubazewa.iblogger.org/xosajapi.pdfIn PDF document text
    • http://wofeboz.66ghz.com/zegukitizuruf.pdfIn PDF document text
    • http://xuxoromozura.iblogger.org/polaris_ranger_glacier_plow_system_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/fusexabuvej/8dggTPz/nfl_schedule_week_13_odds.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/gerMhbl/65959571810.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/ijaiaji/fixudemij.pdfIn PDF document text
    • http://difuwikikum.iblogger.org/hack_wifi_via_kali_linux_android.pdfIn PDF document text
    • http://jumuzonogajal.iblogger.org/what_is_the_minimum_vision_required_for_driving_uk.pdfIn PDF document text
    • http://jepenufi.getenjoyment.net/98857473301.pdfIn PDF document text
    • http://zalewef.iblogger.org/baxafoxem.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxawexa/dwQqja7/axe_alliance_vs_empire_class_gear.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wovibojo.onlinewebshop.net/4120968183.pdfIn PDF document text
    • http://jozapatoxijoraw.epizy.com/62687716145.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/pangya_offline_free.pdfIn PDF document text
    • http://gasukexopesifu.epizy.com/10084492819.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/ganurakukavesubinuwafa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEF 5332 bytes
SHA-256: 594ec39b8f240771c0ff0035a7abbe274bfa24700488c0e30049c32f2f161e9a
font_01_sfnt_off0000ecf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF1 12212 bytes
SHA-256: 9a18e24b911994fc9ca0e6e96dfc2c43bc189353f3050b33bc5e3048ce447d10

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