Malicious PDF — malware analysis report

Static analysis result for SHA-256 2547b3d16fb5d029…

MALICIOUS

PDF

80.3 KB Created: 2021-04-05 07:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6a4e5dbf6e5a6464183546308fec778b SHA-1: dd4acd7ecae85573c179fad23e96f410c8db7df8 SHA-256: 2547b3d16fb5d029556fb8dd7ab0edb56623e20ac033fbab82256e310a09bd94
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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/strik?utm_term=what+is+the+breathing+process PDF link annotation
    • http://fridgeservice.ru/grade_2_spelling_words_albertamx4be.pdfIn PDF document text
    • http://whalesqpa.fun/brilliant_earth_promo_code_august_2020zz5m3.pdfIn PDF document text
    • http://propovar.ru/sigowirifopukiburonesak6xd2f.pdfIn PDF document text
    • http://sokfresh.fun/trevor_noah_born_a_crime_bookpj10e.pdfIn PDF document text
    • http://nujilotadotila.iblogger.org/medical_representative_training_books.pdfIn PDF document text
    • http://nadahul.ru/36099275106imny6.pdfIn PDF document text
    • http://max-lifting.store/91764631296pcl8b.pdfIn PDF document text
    • http://aarbuz.space/mp_bsc_bed_application_form_2019ipac5.pdfIn PDF document text
    • http://forkidsshop.online/tinkercad_arduino_tutorialccg87.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/download_3d_models_for_sketchup_2016fxu8x.pdfIn PDF document text
    • http://winoorama.fun/wizijexisaluxiwuduvuwuyaci.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
    • http://rawuzogese.rf.gd/the_complete_acid_reflux_diet_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/lufemegubukadajufevo.pdfIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_ed281306b27a4fe0a08e3c5522b91156.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zonivezada/89883387103.pdfIn PDF document text
    • https://d1ced4a1-fa29-4c66-b583-77209f32159a.filesusr.com/ugd/c88d8b_84f50637d0aa418d9e5edfbe128bbd75.pdf?index=trueIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_1a01bf5bab024e9cb9b930ce08272028.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/7544910247.pdfIn PDF document text
    • http://zavukazena.epizy.com/steppenwolf_born_to_be_wild_tab.pdfIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_1a31b3a4929b46198040941bb5d9d586.pdf?index=trueIn PDF document text
    • http://podisibasozo.rf.gd/nemazifexerimepaxusuvegu.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/because_he_lives_piano_chords.pdfIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_7b5fbf2f83a54395a359488963a789cb.pdf?index=trueIn PDF document text
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_ced74792c22e4253810d196a2eadd67e.pdf?index=trueIn 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_off0000ed70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED70 5104 bytes
SHA-256: c45ea2906ae1d491e531153f08467bf9f42041960049d69fd14f0407a4e27448
font_01_sfnt_off0000fec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC0 10920 bytes
SHA-256: 123d1c2d7d36d3b9c303ddc9843166a33cd2a5f6094ad2f996903800c914fb8d
font_02_sfnt_off000123f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F7 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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