Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d47f0ebf9aabc1…

MALICIOUS

PDF

79.2 KB Created: 2021-03-20 22:23:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 567796b547bc5fc2113e98b5498508ea SHA-1: b4ddd478ea03c97174d2cc81e8bc0a0bf04abd08 SHA-256: b4d47f0ebf9aabc1f69b4b6435b32db3e7186653e959884845048418333fe9df
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The document body, though partially garbled, contains text suggesting it is a "Reddy heater parts list", likely a lure to disguise the embedded malicious URL. The primary IOC is the external URI pointing to jumiwimov.ru, which is likely used to host a malicious payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=reddy+heater+parts+list
    • https://cdn-cms.f-static.net/uploads/4427097/normal_60258ba07ae14.pdf
    • https://cdn-cms.f-static.net/uploads/4388416/normal_601c9942efe27.pdf
    • https://cdn-cms.f-static.net/uploads/4369506/normal_6029915476ca6.pdf
    • https://static.s123-cdn-static.com/uploads/4380701/normal_60075ebb4d6d8.pdf
    • https://static.s123-cdn-static.com/uploads/4387218/normal_5fc9b36bd159e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zijemuviwovo.rf.gd/bihar_board_online_admit_card_2020.pdf
    • https://s3.amazonaws.com/zewimu/chevrolet_impala_2010_manual.pdf
    • http://pemojam.rf.gd/2388673773.pdf
    • https://uploads.strikinglycdn.com/files/96b5201f-97ec-44c9-a563-45fc52333702/nevonug.pdf
    • https://s3.amazonaws.com/pusori/advanced_english_test.pdf
    • https://s3.amazonaws.com/zatasipezeg/71675428165.pdf
    • https://s3.amazonaws.com/vufupu/reference_sheet_for_math_6-_8.pdf
    • https://s3.amazonaws.com/resisuna/88985512081.pdf
    • https://s3.amazonaws.com/pilazi/albion_online_reputation_guide.pdf
    • https://uploads.strikinglycdn.com/files/a967f7fc-3422-47c0-85cf-5fa46c5bc5e4/2013_ultraslim_docking_station_firmware_download.pdf
    • https://s3.amazonaws.com/xamibudasagas/mofewub.pdf
    • http://paluluw.epizy.com/fepasulami.pdf
    • https://s3.amazonaws.com/kikunojulejuj/when_i_met_you_love_quotes.pdf
    • https://uploads.strikinglycdn.com/files/5f016e1a-50c3-42d3-98ed-afec206802de/tl-wpa4220_custom_firmware.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f79f.bin
624ebd896c6431c26734685d23b8fc3e61b5b5f39ca3fc4033c82397df593baf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF79F 5156 bytes
font_01_sfnt_off0001092c.bin
9b7ab31cffe7886fb0dcc19d9da4ac6dcd3ecdf9c15b3ef09d735e767e63de6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1092C 11444 bytes