Malicious PDF — malware analysis report

Static analysis result for SHA-256 4547a269dd8139a0…

MALICIOUS

PDF

72.6 KB Created: 2021-02-23 09:51:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1248d123add1d894710ae451c53f5b4d SHA-1: 0550822425c5fe5b4fe2b37240d9d6cb15b56a0a SHA-256: 4547a269dd8139a042da483ea32b7db229918fd04f6bafd72755381893e0e248
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various disposable domains and link farms, indicating a phishing or scamming attempt. The primary malicious link identified is 'https://crophysi.ru/strik?utm_term=how+to+catch+the+biggest+fish+in+ocarina+of+time', which is flagged as a redirector to malicious infrastructure. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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/strik?utm_term=how+to+catch+the+biggest+fish+in+ocarina+of+time In PDF document text
    • https://cdn.sqhk.co/purizepore/3ggjajk/vasomufakusomanuxe.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/g6hekuD/scrap_gold_and_silver_prices_per_gram.pdfIn PDF document text
    • http://jiludedo.iblogger.org/pokemon_let_s_go_eevee_guide_serebii.pdfIn PDF document text
    • http://bubiver.iblogger.org/english_common_words_list_with_meaning_in_urdu.pdfIn PDF document text
    • https://wifadesar.weebly.com/uploads/1/3/5/3/135345928/moges.pdfIn PDF document text
    • http://tijevuwotej.22web.org/abstract_reasoning_test_epso.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/hfjgBTI/fezipapivawubodebokuri.pdfIn PDF document text
    • https://cdn.sqhk.co/sozovifena/ItidXid/alarmy_app_download_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/geLAEjf/xagedikonamabigusim.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/chcjhGy/mad_day_truck_distance_game_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tuponapalab/DgegfHC/tosotidelor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fozabenisos.epizy.com/14661984817.pdfIn PDF document text
    • http://devuzobek.rf.gd/radio_bodor_sunda_cangehgar.pdfIn PDF document text
    • http://xidozuk.rf.gd/93079394529.pdfIn PDF document text
    • http://sonowodiguvab.epizy.com/kidde_model_kn-cosm-1b_manual.pdfIn PDF document text
    • http://misagabevud.rf.gd/simple_profit_and_loss_statement_template_excel.pdfIn PDF document text
    • http://rewifavad.epizy.com/37771977122.pdfIn PDF document text
    • http://perepidowowavam.epizy.com/does_red_bull_give_you_more_energy_than_monster.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_off0000df6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6C 5456 bytes
SHA-256: 95b5c2ff308ea6124044f6f439616e6758f48316c3125caca82d83cae72eefd2
font_01_sfnt_off0000f1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EA 10268 bytes
SHA-256: 0bf62b2bf1f3f2d9d2ba2c98e67db6f1e02924f0f85303cbec141b5b13d1274f

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