Malicious PDF — malware analysis report

Static analysis result for SHA-256 9622f32f38835c5c…

MALICIOUS

PDF

86.6 KB Created: 2021-04-05 19:40:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 418a03fb308c7f47b3101a89455ce40d SHA-1: a926fca2ba628e6a1f0481de76ec68edd4f6c0d5 SHA-256: 9622f32f38835c5c999b96e26e065e4a7864ce5480e24eaaae0bf53525863c7b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crophysi.ru/123?utm_term=makongoro+choir+songs In PDF document text
    • https://muwamobole.weebly.com/uploads/1/3/4/3/134356931/6515322.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/70940396166.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/27684218661.pdfIn PDF document text
    • http://lepasipun.iblogger.org/shampoo_solutions_for_oily_hair_and_dandruff.pdfIn PDF document text
    • https://xorexataziz.weebly.com/uploads/1/3/4/4/134496469/gafabasuvuli_wawavagigo.pdfIn PDF document text
    • http://zisezamerares.mygamesonline.org/sbac_practice_test_8th_grade_math.pdfIn PDF document text
    • https://bozuwosumexoxal.weebly.com/uploads/1/3/2/6/132682772/sumezifonosijes.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/ujhhfgi/janugad.pdfIn PDF document text
    • http://nedavupagisezim.mygamesonline.org/what_are_the_four_principal_parts_of_the_declaration_of_independence.pdfIn PDF document text
    • https://cdn.sqhk.co/luwonowuwig/gcheuic/bluestacks_for_window_8_64_bit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xifedesekelogu.epizy.com/nabaximakababas.pdfIn PDF document text
    • http://sejedusodumevu.epizy.com/tofonasufif.pdfIn PDF document text
    • http://damopota.rf.gd/how_to_teach_text_structure_middle_school.pdfIn PDF document text
    • http://muwosogada.rf.gd/zumol.pdfIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_fe8c26ddbc32440881aa5a858387cd97.pdf?index=trueIn PDF document text
    • http://wuseruri.rf.gd/easy_piano_sheets_roblox.pdfIn PDF document text
    • https://78636f1b-f2d6-4e4a-b4e1-07eac4c165d1.filesusr.com/ugd/434c97_0eb5e5d6104f445a878bad8406bca256.pdf?index=trueIn PDF document text
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_e6e86f5bb8bd446585be0b06ea3a795b.pdf?index=trueIn PDF document text
    • http://sivojosifa.epizy.com/abaqus_theory_guide_6._14.pdfIn PDF document text
    • http://gafomawonerif.rf.gd/bhartiya_samvidhan_ki_visheshta.pdfIn PDF document text
    • http://kitilogokufalu.atwebpages.com/can_i_get_a_hazmat_endorsement_with_a_class_c_license.pdfIn PDF document text
    • https://0a38098d-26c8-4844-ab0b-2dfc398d7f8d.filesusr.com/ugd/fffd55_a66ab015b2394216a7c9ea7bc07b4e35.pdf?index=trueIn PDF document text
    • http://wepaxilex.epizy.com/sepagadolufa.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_off0000fffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFA 5096 bytes
SHA-256: add2874a64a342fb2d8e11dee2d8daf2f500c0c854620833fa6353e01b9b0dd3
font_01_sfnt_off0001115c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115C 10684 bytes
SHA-256: a168db0470f3a8507448b81aea6be5e7de4af9bf6da2da4c90053b042be36276
font_02_sfnt_off000135eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EB 16312 bytes
SHA-256: 028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b