Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7603e5ad86dcd7…

MALICIOUS

PDF

78.4 KB Created: 2021-03-28 19:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0216eb5e1e87109f29d4d9667f817459 SHA-1: 5e00b34064c48608060c656e4fc223654f353449 SHA-256: 9c7603e5ad86dcd722161fbb291eae249a830dbe7b88e368e1445c4a2844e3da
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://bologen.ru/strik?utm_term=3+adjectives+to+describe+jungle PDF link annotation
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/nolefu.pdfIn PDF document text
    • https://cdn.sqhk.co/tezejikibus/Tjdhhje/dewizazeler.pdfIn PDF document text
    • http://topfrag.rip/organic_chemistry_tutor_hybridization19d74.pdfIn PDF document text
    • http://arevakar-travel.com/98563795314t8gmk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375896/normal_5fe60a19e59d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383445/normal_604e4ccb95d5f.pdfIn PDF document text
    • http://operationhomeplate.com/war_and_peace_tv_series_season_2p5ccu.pdfIn PDF document text
    • http://bestrongbyg.com/vortech_mp10wes_manualvs2ht.pdfIn PDF document text
    • https://gotedimonov.weebly.com/uploads/1/3/4/7/134761190/773799.pdfIn PDF document text
    • http://samyog.ru/raburapojemimhxyx6.pdfIn PDF document text
    • https://neruwutuwi.weebly.com/uploads/1/3/5/9/135960217/a7360b51b9.pdfIn PDF document text
    • http://nesobaka3.xyz/the_beatles_complete_chord_songbook3i2kf.pdfIn PDF document text
    • http://aycotoro0.xyz/407670143625dw4a.pdfIn PDF document text
    • https://tatabano.weebly.com/uploads/1/3/4/8/134850833/5058624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477873/normal_5fd3aacb7b69b.pdfIn PDF document text
    • http://shmelev.pro/how_to_become_a_registered_professional_recruitermy9r7.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwoxebu/GEphchb/classic_frogger_game_download_free.pdfIn PDF document text
    • https://vijibasotaxeja.weebly.com/uploads/1/3/5/9/135990507/kabonobufozeluli.pdfIn PDF document text
    • http://bonusiotsbera.online/43867531692osbrg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/28ba4b08-1983-4c2a-b0cb-aa0e81c73b75/biochemistry_book_stryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a08c3f-e8ff-434b-abcd-8eef978e958e/honeywell_rpls740b_installation_instructions.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_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 5452 bytes
SHA-256: a19af4a4d682d95c6404057a19e4c8878ec7a47ba2fa399165637f567245638f
font_01_sfnt_off0001066f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066F 11132 bytes
SHA-256: 73d38d61436b346ed6b9c59fa4337a318eb846a7964be7ced74fc545cfd0ec9d

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