Malicious PDF — malware analysis report

Static analysis result for SHA-256 16fe92e2746c9aad…

MALICIOUS

PDF

77.8 KB Created: 2021-03-08 16:41:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f25939e5df066bc82a0a93ebfc72c3fa SHA-1: c777b619e3eb3d682f878334250e2121c5177c64 SHA-256: 16fe92e2746c9aadfc82a74cd2543ea014297e35dce34e27456cfb6eba5db7fb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'ionic bonding worksheet gcse', indicating a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://jacksth.ru/wix?keyword=ionic+bonding+worksheet+gcse PDF link annotation
    • https://sobomevoza.weebly.com/uploads/1/3/0/7/130739746/9661137.pdfIn PDF document text
    • https://rojogude.weebly.com/uploads/1/3/4/3/134396813/6464267.pdfIn PDF document text
    • http://kengoru.space/49587176983dkayx.pdfIn PDF document text
    • http://znakomstva18x.site/patch_for_microsoft_office_2016nkasz.pdfIn PDF document text
    • https://fakibugopozap.weebly.com/uploads/1/3/2/7/132712115/3262224.pdfIn PDF document text
    • https://bibatajikoxego.weebly.com/uploads/1/3/5/3/135315017/zijixomifiwob.pdfIn PDF document text
    • https://pazunorafozide.weebly.com/uploads/1/3/0/7/130776571/pilurenupazis.pdfIn PDF document text
    • http://manybigs.space/sodojanabimutpx2ga.pdfIn PDF document text
    • http://cparta.moscow/853571584467iqbt.pdfIn PDF document text
    • http://tafagejiveduda.22web.org/24008606869.pdfIn PDF document text
    • http://vereffka.xyz/23740814861r07v6.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/4f7cc806-d59f-40bf-9d6e-24fd75c7709a/tecnicas_de_redaccion_coherencia_y_concordancia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9460ba4-091c-43f3-8316-f6c12a92fc15/21500095702.pdfIn PDF document text
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_0f7b32445c6e45c2ae241e0933615921.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/595f8380-74f4-4a3f-93e8-30f7cea65b43/how_do_i_love_thee_by_elizabeth_barrett_browning_rhyme_scheme.pdfIn PDF document text
    • http://rovafitazilom.epizy.com/city_calgary_bike_path_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fab29ab5-acb2-4951-bc84-968145aa044d/minecraft_island_seed_ps4_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fc94922-c399-4965-9d1f-9d55efdc2591/the_story_of_ruby_bridges_by_robert_coles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/355f462a-d04b-4d61-b29f-dfccc324c361/68271174466.pdfIn PDF document text
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_93315ac0cedf40bbbf5cd874288605fa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8e9d53e-5ae3-4636-9fac-d94fc40675e1/86703900535.pdfIn PDF document text
    • https://c8019651-2137-4367-b38e-775fff3f8a75.filesusr.com/ugd/fc5a02_b4db58bf58d447888b1213dd804d0870.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a180adbe-9258-4574-b0bd-dfdf551c8073/66292263788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2941161c-4983-4636-afdb-81c753e3c67e/taxaluwo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF66 5192 bytes
SHA-256: 0c0c19523f7185cb44d33b133d3284c2388eb496c16e9c8764120e23c4e6840f
font_01_sfnt_off0000f11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 10232 bytes
SHA-256: f2d2c64f0753cde1e77fc07bee7cbd38c5e3ec85a89c1036d0a22fd8dd5109c8
font_02_sfnt_off00011460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11460 16088 bytes
SHA-256: ba49a359edda73fb432b2118eee43e8681603f6c6f845ef214af08c3a95321db

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