Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f13c1cd1131b51d…

MALICIOUS

PDF

91.7 KB Created: 2021-03-16 03:00:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b4763c0a0c0490987e7ef9cdf43eb36 SHA-1: 275a87d648815315ff910c89450e93827d3cd81d SHA-256: 0f13c1cd1131b51da28560aaeb0ad948c8f5a50821d9640ead192371826e3c4c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to a suspicious URL on 'gimoguvi.ru'. ClamAV detection and ML classification strongly indicate maliciousness, likely related to phishing or a trojan. The presence of embedded URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/wix?keyword=%25D0%25BF%25D0%25BB%25D0%25BE%25D1%2589%25D0%25B0%25D0%25B4%25D1%258C+%25D1%2582%25D1%2580%25D0%25B5%25D1%2583%25D0%25B3%25D0%25BE%25D0%25BB%25D1%258C%25D0%25BD%25D0%25B8%25D0%25BA%25D0%25B0+%25D1%2584%25D0%25BE%25D1%2580%25D0%25BC%25D1%2583%25D0%25BB%25D0%25B0
    • http://vivekawiga.sportsontheweb.net/cant_see_wd_my_passport_on_mac.pdf
    • http://runojiwum.getenjoyment.net/lightning_arrester_file.pdf
    • http://boraguw.medianewsonline.com/63919937997.pdf
    • http://serururepus.scienceontheweb.net/coordinate_graph_worksheets.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/satedafadusizo/tibosivukitixaxawe.pdf
    • https://uploads.strikinglycdn.com/files/3715db71-f3af-430f-9faf-a4026789355d/how_to_write_interview_feedback_examples.pdf
    • https://uploads.strikinglycdn.com/files/830b5483-0711-4cd7-9077-57fa971c3dd8/duvitobunilefuju.pdf
    • https://uploads.strikinglycdn.com/files/bce262fe-380d-4881-9212-9facb49c45b0/93384722311.pdf
    • https://s3.amazonaws.com/lewuli/gramatica_the_verb_tener_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/a5356979-e755-4b2e-bd86-f12f75d4bb3a/fonosewulen.pdf
    • https://uploads.strikinglycdn.com/files/8daa0183-28b6-4fd8-9b38-a3c9c3f89f1a/calculo_diferencial_e_integral_serie_schaum_tercera_edicion.pdf
    • https://s3.amazonaws.com/kopisigapub/devajawaku.pdf
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_f81a02a0275f45f9b9f10b9d0afc7c0c.pdf?index=true
    • https://s3.amazonaws.com/xukonakefules/nurelegunitiboverebox.pdf
    • https://s3.amazonaws.com/garorowa/year_3_maths_addition_worksheets.pdf
    • https://s3.amazonaws.com/dutimajizowa/26720567426.pdf
    • https://uploads.strikinglycdn.com/files/9af6dcc9-a348-445a-84ad-78d248a6f7ff/what_does_mark_twain_argue_in_the_damned_human_race.pdf
    • https://uploads.strikinglycdn.com/files/0d13d0a4-8e1c-4976-97a9-25f6f21197cd/xebogejegetoruzoni.pdf
    • https://s3.amazonaws.com/risisipajole/pavidexegubividuw.pdf
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_2860de5cb8d14a818a7304b9a0fcd4c6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/11a8fd7a-9884-4673-97a1-f042ac99016b/is_there_a_cheat_to_make_your_sim_go_into_labor_sims_4.pdf
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_d8f28878fa0c4bf68c90e72fe9f5f690.pdf?index=true
    • https://2c91b947-1dd8-401e-ae91-d595f2f75867.filesusr.com/ugd/0af078_d4e300585385445dbc6b4e5b875b650c.pdf?index=true
    • https://s3.amazonaws.com/wiwamoxamo/how_many_covid_19_in_el_paso_today.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e42c.bin
ec0ef6353788adc509d41dd818f3f491393939561bfcbc167aab2dd03bd88f34
pdf-font-stream PDF embedded font (sfnt) at offset 0xE42C 5064 bytes
font_01_sfnt_off0000f562.bin
8df9a2a82bea875032d15e47e75988a0111951a9697a6f97850f1a22eddb571e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF562 6112 bytes
font_02_sfnt_off00010699.bin
0591bd5d6685eb6a90ea30f4b2b10e12616f697e371503d8f903ae92c7635ef5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10699 15852 bytes
font_03_sfnt_off000138a4.bin
4636c7523e8c0c4659ec89c752f488d70eb2ea504770eb3e0be851c502e4ce70
pdf-font-stream PDF embedded font (sfnt) at offset 0x138A4 16488 bytes
font_04_sfnt_off00014f11.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F11 4324 bytes