Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c59295fe246c20…

MALICIOUS

PDF

97.5 KB Created: 2021-03-30 05:39:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 26f8776e92cfd5b1873aae9dcd69c543 SHA-1: db6316b61684a5ad16e39ead55918a5181b501c2 SHA-256: a7c59295fe246c2083f2dacc2678abd6c0f539580c599e0dcf2e24ef63e91e35
244 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 redirector link and a large link farm. The presence of numerous external links, many hosted on disposable domains or redirectors, suggests an attempt to lure users to malicious sites. While no scripts were extracted, the PDF structure and link farm indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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://yafferge.ru/wix?keyword=steel+magnolias+monologue+shelby In PDF document text
    • https://cdn.sqhk.co/momugutatok/pgdibGm/national_emergency_alert_system_cell_phones.pdfIn PDF document text
    • https://nupuwumot.weebly.com/uploads/1/3/5/3/135305030/punorokob_wulonafub.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaso/gcAiaeW/recharge_mobicarte_sfr_maghreb.pdfIn PDF document text
    • https://cdn.sqhk.co/diwidivu/jff65Bp/wisoliw.pdfIn PDF document text
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/biduzekovafaxunexu.pdfIn PDF document text
    • https://wobosiwax.weebly.com/uploads/1/3/1/6/131607505/9cccb08571d.pdfIn PDF document text
    • https://cdn.sqhk.co/xogixute/AfOUje7/plus_points_expiration_united.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/gcjjigX/minecraft_tlauncher_mods.pdfIn PDF document text
    • https://cdn.sqhk.co/zotiperugi/ijiqXxd/hill_drive_cafe_near_nandi_hills.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/digital_communications_specialist_job_role.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/cjgie22/learn_english_grammar_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biwosagamivi.myartsonline.com/anxiolytics_drugs.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/attack_on_titan_season_4_episode_6_release_date_philippines.pdfIn PDF document text
    • http://zamonile.epizy.com/world_war_1_webquest_answer_key_ducksters.pdfIn PDF document text
    • http://satovimowenijor.myartsonline.com/lawazepeziluzigipesudo.pdfIn PDF document text
    • http://kibagog.onlinewebshop.net/81361225178.pdfIn PDF document text
    • http://zukewazidokik.rf.gd/how_to_do_ratios_khan_academy.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/51892926452.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/pq_o_titulo_de_eleitor__cancelado.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/1984_chapter_2_discussion_questions.pdfIn PDF document text
    • http://lajofekozorofa.rf.gd/rosario_dela_divina_misericordia_cantado_por_gladys_garcete.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_off00014253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14253 5348 bytes
SHA-256: 2671bcf6c36efeabc44b5ebac7ecb0ad2c377444ad7e1b873ca271b73be23089
font_01_sfnt_off00015465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15465 10648 bytes
SHA-256: 8dbdb23d5a68ee06f825a5a0f2f78aecfbfaef94e2aeb4acdec2b5b24c7fa3f2