Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6836eeae0453b4…

MALICIOUS

PDF

73.9 KB Created: 2021-03-24 12:13:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2866d47529399d9d32048d8330bb1d98 SHA-1: 42da13010d2e5dd3f3bc751d639bf4db28ab57e1 SHA-256: 5f6836eeae0453b421f66514aac572f8a1e6b86a96d73f267d366aa04673ced5
184 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/strik'. This indicates the document's primary purpose is to lure users to a malicious site. While no scripts were extracted, the PDF structure and embedded link strongly suggest a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://yafferge.ru/strik?utm_term=filipino+seventh+day+adventist+church+near+me In PDF document text
    • https://cdn-cms.f-static.net/uploads/4445130/normal_6044ae1c421be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421354/normal_5feb4ecd95b67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369907/normal_60412d09df2b1.pdfIn PDF document text
    • http://juvugewit.iblogger.org/xesapekakiditegidiled.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487416/normal_5fec4ce744e7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450723/normal_5fd80e1f8a31d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415077/normal_5fe54e041132d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388293/normal_60305fdf1625f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451039/normal_6053c8de0e271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476577/normal_6058efe3506d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503050/normal_5ff20f5f07b6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409801/normal_5ff49a66c1fe9.pdfIn PDF document text
    • https://pathfinders.llfc.org/In 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/71edbbc5-8a82-4353-ad27-a5a7aa733795/17_indisputable_laws_of_teamwork_summary.pdfIn PDF document text
    • http://watokugen.epizy.com/dungeon_master_guide_5_ita.pdfIn PDF document text
    • http://saxidilola.rf.gd/fowidil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe4ebb69-a99d-4d97-b082-ddb9b3ca9378/kugakenafobukidawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/200efc31-7a08-4a07-8007-2ad3f8900e2b/33225820002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63cbf82e-23ed-42db-9fcd-441ef5c46ae4/how_to_get_battery_out_of_braun_thermoscan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad5ebc61-2511-45e8-81d8-b31e449b10ee/bounty_hunter_gold_digger_metal_detector_reviews.pdfIn PDF document text
    • http://dupikupujetilu.rf.gd/catholic_answers_live_number.pdfIn PDF document text
    • http://zumoriko.epizy.com/vamajapavojeti.pdfIn PDF document text
    • http://togewogovimome.epizy.com/successive_discounts_worksheet_answers.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_off0000e167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 5428 bytes
SHA-256: 484d12ce3850750b670a25a5509f5b1ec6c86ebc2a0d9d9d0486fb08bf9da25c
font_01_sfnt_off0000f3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CA 11220 bytes
SHA-256: 3658e6f6450b699929cd04e8104ec1f12de0e73695be92bd2e2872bc345eb9e6