Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6b27373912efd9…

MALICIOUS

PDF

77.3 KB Created: 2021-04-02 20:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a9a1138933b7d9b55b84557435d4ba8 SHA-1: 6d2edcff971c3d95e32cc696676b764ab4087b09 SHA-256: 5f6b27373912efd90e29ca9822633d146b080a36858fdb3ede554e9d2f355a5d
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'pelibifir.ru' strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a common attack pattern where documents lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/award?keyword=before+you+accuse+me+tab+pdf
    • http://logawedulukudan.mywebcommunity.org/louis_berkhof_systematic_theology.pdf
    • http://reestr.site/557816911584bzv9.pdf
    • https://cdn-cms.f-static.net/uploads/4499636/normal_6017a4eae394f.pdf
    • http://ottics.ru/lange_smart_charts_pharmacology7og1b.pdf
    • http://wepirafigezatid.22web.org/amoeba_sisters_enzymes_answer_key.pdf
    • http://sufaxaviko.22web.org/bahishti_gohar_download.pdf
    • https://static.s123-cdn-static.com/uploads/4490127/normal_5fe54d2a1804e.pdf
    • http://beautytopshop.site/autocad_command_window_missingxlh03.pdf
    • http://konufij.22web.org/pabopimekakewolajegudutin.pdf
    • https://cdn-cms.f-static.net/uploads/4465136/normal_600fc59417fe8.pdf
    • https://cdn-cms.f-static.net/uploads/4369333/normal_604b08cae2c73.pdf
    • http://ubzvp.com/allregs_fannie_mae_servicing_guide45lar.pdf
    • http://hopecommunitynaz.com/my_sims_3_mods_folder_downloadrjl4y.pdf
    • http://nanonewe.scienceontheweb.net/fnaf_silver_eyes_full_book.pdf
    • http://parovosi.mygamesonline.org/26720594924.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zupitatip.atwebpages.com/if_every_living_thing_dies_alone.pdf
    • https://uploads.strikinglycdn.com/files/3f4c2003-475a-464f-a469-72dbce65e661/vagegovi.pdf
    • https://uploads.strikinglycdn.com/files/70c26d6b-5226-4047-9685-f53b83720600/1273544330.pdf
    • https://uploads.strikinglycdn.com/files/b769ce83-9541-4541-9a48-40953d8301b8/samsung_rs265tdrs_error_code_22e.pdf
    • http://pekowob.onlinewebshop.net/antecedentes_de_la_calidad_de_vida_laboral.pdf
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_db3b49ce0c784f4c9ae1abccbfb45945.pdf?index=true
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_7186af344890458f9e28800456ede031.pdf?index=true
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_14702253e662466080766da37cdcdb30.pdf?index=true
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e453.bin
c5aa54f84f41f7fcba316f2f99e536fa8e9d26b0c54be30e3dba0cb16b469b24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE453 5288 bytes
font_01_sfnt_off0000f656.bin
efe3fa64eb71ded4797c782cb3bea2bf1e3a10ad6ed210a744c777b729ff5e0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF656 10560 bytes
font_02_sfnt_off00011953.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11953 4324 bytes

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