Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab2782adf1c988da…

MALICIOUS

PDF

72.0 KB Created: 2021-02-15 01:46:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2270ca63ebd99fae72bbb8cc9b97f16f SHA-1: f3a4b27e8b7848afb6fbdee55ce87c436696c360 SHA-256: ab2782adf1c988da3f23b16bb3ad95302799a43b9938faa5cc115a1f2967b6f7
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the heuristics strongly suggest the document's purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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 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.
  • 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/wix?keyword=lincoln+younes+son In PDF document text
    • https://cdn.sqhk.co/zudilubal/bxjdPgc/jungle_heat_hile_apk_android_oyun_club.pdfIn PDF document text
    • https://zinorenote.weebly.com/uploads/1/3/5/3/135349773/2f78e.pdfIn PDF document text
    • https://tifixexeruwa.weebly.com/uploads/1/3/2/6/132682204/2590004.pdfIn PDF document text
    • https://cdn.sqhk.co/safovokon/XWhh2fz/dash_slim_wallet_3._0.pdfIn PDF document text
    • http://babozim.22web.org/neonatal_hyperglycemia_guidelines.pdfIn PDF document text
    • https://pukefigagarit.weebly.com/uploads/1/3/1/4/131406744/234051a780291.pdfIn PDF document text
    • https://cdn.sqhk.co/danexili/ghifVXv/bouncy_seed_mod.pdfIn PDF document text
    • http://gisisavodure.22web.org/namisitaduwinusasasi.pdfIn PDF document text
    • http://varnisvakq.ru/merriam_webster_app_androidum2pt.pdfIn PDF document text
    • http://1s.london/financial_reporting_acca_cbepdpnk.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/1biagdo/23869050657.pdfIn PDF document text
    • http://widevuvi.22web.org/granny_mod_menu_null_zerep.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
    • http://xugivazule.rf.gd/wetukukofapamo.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_off0000d33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33C 4332 bytes
SHA-256: 0f74fb7487459bfba4797e7c1e686dd6526be79cecd2183f476bb14bcb7a771d
font_01_sfnt_off0000e1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FA 10400 bytes
SHA-256: 2c01f760444b3888ac95902d38a2934caaf83c190d70a52ef5517b9b0510f8e3
font_02_sfnt_off0001058f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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