Malicious PDF — malware analysis report

Static analysis result for SHA-256 56560cdf8c3e361f…

MALICIOUS

PDF

76.4 KB Created: 2021-02-16 03:33:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: df8f393f2fb438b7f4b55251490cac29 SHA-1: 633ef59b15f7db398aa49d469af1d7fcca8c92c1 SHA-256: 56560cdf8c3e361f8a4dc6efbbe6af7fa71d0d60c8e60e0ea118d24b6b1eeb53
184 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it was programmatically generated. The presence of numerous links to disposable domains and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=how+do+i+become+a+visual+storyteller+on+facebook In PDF document text
    • https://static.s123-cdn-static.com/uploads/4411228/normal_5fed6c2d9ba8f.pdfIn PDF document text
    • https://cdn.sqhk.co/xonarewu/hBghWNn/flowers_stickers_2020_wastickerapps_flowers._com.pdfIn PDF document text
    • https://cdn.sqhk.co/fidapulano/Yiejdia/trade_tycoon_billionaire_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wokuvaxevaji/ihcghWp/loruligekedowilaxa.pdfIn PDF document text
    • http://bt-management.website/2290177951273x6d.pdfIn PDF document text
    • http://lifeshop.pro/43835689978ma941.pdfIn PDF document text
    • https://cdn.sqhk.co/kuderoxuz/rhgiJhh/73985245044.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499633/normal_6023c76cb7e16.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/UjhF9b3/70625962481.pdfIn PDF document text
    • http://securespot.ru/anomalias_dentarias_de_numero_y_formam9adw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424647/normal_5fdff4ea426f8.pdfIn PDF document text
    • http://streichpack.online/42393756530zr2rc.pdfIn PDF document text
    • http://online-bestshop.xyz/54328492894xlcs9.pdfIn PDF document text
    • http://hotloveme.online/pubg_awm_gun_sound_ringtone_download_mp3rbxof.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/ZidsjcV/lethal_injection_survivor.pdfIn PDF document text
    • http://bighome.space/776200136247xwjv.pdfIn PDF document text
    • https://cdn.sqhk.co/tiviluluje/hjchigg/vintage_galaga_arcade_machine_for_sale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/alain_soral_livre_gratuit.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/depository_institutions_research_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/cbt_treatment_plan_for_anxiety.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_off0000ec9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9E 5584 bytes
SHA-256: d931b22cc70b663f98a288edfad991ec8eab984d8e0ed05db5146af0f79fbc50
font_01_sfnt_off0000ff99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF99 10684 bytes
SHA-256: 6ee94e7def01d9f2aab5874e514e0d170b26c8a71fb4b840534c2eb9ec7fc48a

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