Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c92abca26aa3af…

MALICIOUS

PDF

76.3 KB Created: 2021-05-25 22:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5aa24ea33a71cd20f531173074f13ddd SHA-1: e18fa3fb961e27965de8bc7b3be675b08c917b5f SHA-256: b2c92abca26aa3af786b163403487004f9fb2ad4a2942728c47dce5324586846
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The primary malicious URL identified is https://midufefew.ru/strik?utm_term=navy+advancement+exam+results+release+date, which is likely used for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://midufefew.ru/strik?utm_term=navy+advancement+exam+results+release+date PDF link annotation
    • https://bawefutazadar.weebly.com/uploads/1/3/5/3/135310886/tukakuwaxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489428/normal_604cf23e69275.pdfIn PDF document text
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/7412083.pdfIn PDF document text
    • https://luvodufugatese.weebly.com/uploads/1/3/4/8/134893210/xinaxigu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416501/normal_5fcd539609885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474985/normal_603f4621467d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386842/normal_6007e4fd9d138.pdfIn PDF document text
    • https://semuzotefol.weebly.com/uploads/1/3/1/4/131437619/1112162.pdfIn PDF document text
    • https://kusejibetejoxer.weebly.com/uploads/1/3/4/7/134749151/midoxu.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://uploads.strikinglycdn.com/files/59bced2a-c512-4bc2-b0c2-160d53ad0b0c/factorytalk_view_se_station_vs_server.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7af01eb-cb19-49f7-aa13-a1c59e1ea0bb/bosox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/046e6588-be06-41b0-b4ae-7b93590b719a/after_the_crash_thousands_of_american_banks_closed_because_they.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/paworin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa20685b-5cda-405f-8bb3-a84b4241ef80/tum_bin_2_full_movie_hd_720p_download_123mkv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06d96000-c9f0-47c9-8f58-1aa879da3c11/hoover_uh72625_windtunnel_3_max_performance_upright_vacuum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c29b9fbb-653e-449d-beee-6f8daf49933e/divilugiz.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/dynamat_damping_sheet_india.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/softball_uniforms_builder.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/36207509889.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/46188251304.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46c78842-338d-48d8-a868-71fdc481b162/54977051964.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65742b74-ef5d-4cda-bcf2-2662c0dd044f/86161153127.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDC 5008 bytes
SHA-256: e7f86da91fad548e0c829832b639444fc9fe7ca921c5b5db99bb493161b4233c
font_01_sfnt_off0000efd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD3 10540 bytes
SHA-256: 06a722fd3cc3128ac0d4fd23c245eeff9cac41be6ff98270479d0ed2ffdb9660
font_02_sfnt_off000113d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D1 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e