Malicious PDF — malware analysis report

Static analysis result for SHA-256 74013af653096bb3…

MALICIOUS

PDF

131.3 KB Created: 2021-03-19 21:07:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fb50db1eb82e2adf46d8fec3d3a01041 SHA-1: 50e8fa91e84757f02c4335731118da52d20caffc SHA-256: 74013af653096bb3009d2e9115f1c1b7e0408bfdf6277758b4add58ff55c2010
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with several pointing to known malicious redirector infrastructure and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=ballroom+e+youkoso+op+full In PDF document text
    • http://odebayitrafikhizmeti.com/how_to_write_a_mystery_storyjg9td.pdfIn PDF document text
    • https://cdn.sqhk.co/dovoxukeni/vgficjc/limbo_game_download_for_pc_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxatotukaru/bie2ja5/zarebududux.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/eiQOggg/hepatitis_b_surface_antigen_negative_means.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481834/normal_6016e3e6797ef.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/5hgIlaM/4k_magic_fluid_simulation_protocol.pdfIn PDF document text
    • http://tugrull.com/968741608786g4ht.pdfIn PDF document text
    • http://avto-trokot.xyz/kodojaex4jz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473035/normal_602c201a5c9c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369914/normal_5fd7a3a97e879.pdfIn PDF document text
    • http://eduha.online/50849194992quqxx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445104/normal_5fe70d0212284.pdfIn PDF document text
    • https://cdn.sqhk.co/xiruregexibe/ifsCyMF/47164015844.pdfIn PDF document text
    • http://sport-stavki.fun/windows_10_free_for_mac_users8bltb.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/kijchgo/visolonos.pdfIn PDF document text
    • https://cdn.sqhk.co/dujujema/cfiijgo/siren_head_sound_effect_roblox_id.pdfIn PDF document text
    • http://espaceabonnes.com/40928169606zmcf.pdfIn PDF document text
    • http://cadenalia.com/how_to_scan_from_canon_to_macf6tdl.pdfIn PDF document text
    • http://reduslim-ufficiale.website/line_segment_ab_notationd52e2.pdfIn PDF document text
    • http://stickerrus.ru/lorovokolisajenemxjs5c.pdfIn PDF document text
    • http://paganel.world/45627722567bv0ks.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380211/normal_60281b173655c.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
    • https://s3.amazonaws.com/zepifudoxapo/bangla_new_natok_2018_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/lipazixovojinibogododejas.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/majesty_worship_his_majesty_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/97964246691.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/74231231559.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 63388 bytes
SHA-256: 3e3dd2099253ff55cc6686f6269cd8cb4ccd2eea7045379d9dfb99dc7f0f7c4a
font_01_sfnt_off0001b829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B829 4908 bytes
SHA-256: 08deec78629996fd54cb9ca5e4fd13b013169f776d4c8a633c9043ace5e986df
font_02_sfnt_off0001c8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8E8 11916 bytes
SHA-256: 2f35d6bb13d68ef42dd385c993faa911e094c537becf3c2c19b168e1ead8c5f5
font_03_sfnt_off0001f07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F07E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e