Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde051e722dcd2db…

MALICIOUS

PDF

79.1 KB Created: 2021-04-24 06:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bc4e1a7a63d701ad6869d6cb4906363e SHA-1: 73308abd3586563a0d8c8c2f42f64e2e7993b7aa SHA-256: dde051e722dcd2db2276e57ffaf8c208039a0d7ff7dcc7a57d7e00832ee39e09
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. While no scripts were directly extracted, the PDF structure and external links suggest an attempt to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://nipisod.ru/strik?utm_term=monthly+rental+agreement+california+pdf PDF link annotation
    • https://cdn.sqhk.co/dolafita/hibCSax/marketplace_appliances_cbc.pdfIn PDF document text
    • https://cdn.sqhk.co/xalurubizud/L6qjh9L/wechat_pay_in_us.pdfIn PDF document text
    • https://cdn.sqhk.co/bekutojeke/e3hdvgf/shooter_games_for_switch.pdfIn PDF document text
    • https://tejojapifofomo.weebly.com/uploads/1/3/4/3/134339563/fidisuro-darir.pdfIn PDF document text
    • https://nijolonarezop.weebly.com/uploads/1/3/3/9/133999518/naguji_jibimuzo_jobavanapal_satuwabibexok.pdfIn PDF document text
    • https://dikufakeg.weebly.com/uploads/1/3/5/3/135348043/7100488.pdfIn PDF document text
    • https://cdn.sqhk.co/wegodimumod/lhg6gjg/rigofebasemuxugazaji.pdfIn PDF document text
    • https://cdn.sqhk.co/togokitaz/Yibje6S/top_scorers_in_nba_history_list.pdfIn PDF document text
    • https://cdn.sqhk.co/gunuzuli/ujjngdd/tidarenevobegiloxupujapo.pdfIn PDF document text
    • https://jakikoxu.weebly.com/uploads/1/3/1/4/131411542/9507861.pdfIn PDF document text
    • https://cdn.sqhk.co/vafizolubev/M0hdkGu/dragon_quest_11_walkthrough_act_2.pdfIn PDF document text
    • https://judozolu.weebly.com/uploads/1/3/1/4/131407514/puminezimovitum.pdfIn PDF document text
    • https://cdn.sqhk.co/xonudutixova/f8zpC0x/facebook_search_by_phone_number_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/jcgdihy/free_hd_screen_recorder_with_audio_no_download.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/tobovunoberiki/28405359086.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/milonelion_riddle_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d1d7948-376b-43c9-92fe-d1b9be26552c/what_was_the_punishment_for_adultery_in_medieval_times.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0d19a9f-bcbe-450d-908c-391f18c6fb84/reasons_to_stay_alive_matt_haig.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/cadbury_sixth_form_college_term_dates.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/zokekejepuxej.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/majobasazabijebedod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f69ebcb2-32b7-4248-ae22-bb15fb870cdf/69342446777.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/kurukshetra_university_bed_exam_date_sheet_2019.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_off0000f77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 5496 bytes
SHA-256: 1994480564938b27572557440ce2b66f212f08f7fe069fb216d0f0f819038aa0
font_01_sfnt_off00010a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1E 10664 bytes
SHA-256: 98806393ca5590ef4e9f0a982426ac72bc433bd7227663204e7c743939b1f435