Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b75093a56d7f475…

MALICIOUS

PDF

181.4 KB Created: 2021-03-30 09:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7393b128c24791dcc54682bc4e25f081 SHA-1: fbd5e41c812c0963ee45aaa3a5310587a9451f68 SHA-256: 1b75093a56d7f47575040f28461b9e7f0eebd4deb161de1f06381a40d80ef65c
66 Risk Score

Malware Insights

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

The ML classifier strongly indicates maliciousness, and the PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to a school supply list, which is a common pretext for social engineering attacks. No scripts were extracted, but the presence of many URLs points towards an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 4

  • 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/wix?keyword=honaker+elementary+school+supply+list PDF link annotation
    • https://cdn.sqhk.co/kuwusemob/kijchgo/visolonos.pdfIn PDF document text
    • http://mirror-x.org/puzuxeq5fxz.pdfIn PDF document text
    • http://helper-badges.com/livefezigewozufivurivovj7gq1.pdfIn PDF document text
    • https://tivofexogi.weebly.com/uploads/1/3/1/3/131398075/xuzosulezikuniba.pdfIn PDF document text
    • http://trelon.fun/918048714956hpqr.pdfIn PDF document text
    • http://verifedform.com/what_is_medical_claims_review699g0.pdfIn PDF document text
    • http://okclub.org/motores_de_corriente_continua_jos_roldn_viloria08v3u.pdfIn PDF document text
    • http://maddot.space/star_trek_enterprise_season_1_episode_4r7boj.pdfIn PDF document text
    • http://investmag.org/amoeba_sisters_human_body_systems_answer_keyb35v0.pdfIn PDF document text
    • https://zemedabumudog.weebly.com/uploads/1/3/2/7/132712209/gekabuvasazux.pdfIn PDF document text
    • http://mebel-albero.ru/how_to_calculate_the_surface_area_of_an_irregular_shapeaeuup.pdfIn PDF document text
    • https://cdn.sqhk.co/kapopajij/mJmGs6U/spectra_flange_size_guide.pdfIn PDF document text
    • https://zabomefekezene.weebly.com/uploads/1/3/0/7/130740536/3bde6f55019d6.pdfIn PDF document text
    • https://dovekawelefirim.weebly.com/uploads/1/3/4/2/134266448/loderexebazimu-navonotironum.pdfIn PDF document text
    • https://worudunomazife.weebly.com/uploads/1/3/1/4/131483266/1231898.pdfIn PDF document text
    • http://sosed.market/clasificacion_de_la_materia_y_su_relacion_con_la_energian8a5t.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://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_dba3d04705a546609485b5cdcb675596.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c0e4896-1674-4e28-a433-f5c93d383a07/2214168571.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b32ed738-0104-450e-82ce-f7cfc048a6ac/delavusoparevameketijapag.pdfIn PDF document text
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_17c31c512bff4c099c8c2d1d4ebeda0e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd191ee9-2ff2-4140-839b-0259abccd75a/how_much_to_change_timing_belt_honda_civic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca5c7e68-4ee2-461e-8e51-b09148fcdefa/shimano_di2_app_for_mac.pdfIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_ca9b806f14a14311908ed77c7b683e4b.pdf?index=trueIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_b27df8a3e7b34de0a4ded0f58cb93a94.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/abdf4841-c07b-480f-b815-d167247f20da/23922791625.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_off00028251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28251 5180 bytes
SHA-256: 5b4bc0819641ba7d54ab9bcd8a87eeb1a38e7d58b770f52041ed84db5e6b7756
font_01_sfnt_off000293c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x293C6 11332 bytes
SHA-256: 76d0bccbd8912a816159efaa455e6d9e98d96996b8fd83b5595c65ef387d4cfe
font_02_sfnt_off0002b937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B937 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2