Malicious PDF — malware analysis report

Static analysis result for SHA-256 becc51c28fcc954b…

MALICIOUS

PDF

77.4 KB Created: 2021-03-20 10:55:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 566cc860f22c0ad18b815e5c7178793c SHA-1: d7c55d40bebe616b1fe44891bb86fd8821e3b032 SHA-256: becc51c28fcc954b76eeeb9c17be3d25135c84231a0699ab38e604b75639e7d6
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains an embedded URI pointing to a suspicious domain. The document body, though heavily obfuscated, suggests a 'worksheet' lure. The presence of embedded URLs and the overall detection pattern strongly indicate a phishing or malware distribution attempt.

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://nipisod.ru/123?utm_term=modal+verbs+obligation+worksheet
    • http://niluwipewuxasa.medianewsonline.com/helter_skelter_zombie_manson_lyrics.pdf
    • http://podcard2020.site/77297244882gyvnf.pdf
    • http://tameenegypt.com/does_rock_band_3_guitar_work_with_ps4i6yf9.pdf
    • http://vozivovog.scienceontheweb.net/relibokojesazowitosutiv.pdf
    • http://fc-aromat.ru/how_to_change_region_on_sony_android_tvctvef.pdf
    • http://giwewigipebi.medianewsonline.com/26008878109.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f2add630-c44f-449f-ad0d-33a02c41e7e4/the_life_and_times_of_frederick_douglass_sparknotes.pdf
    • https://s3.amazonaws.com/lomuper/24832246698.pdf
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_a7d934cbf35d49c5ab4f75bbe18d4555.pdf?index=true
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_3f7c806bcf054bb498e626fd4187ccde.pdf?index=true
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_19e9359284f745f58b7cb851ef561d20.pdf?index=true
    • https://s3.amazonaws.com/lebaxa/22226437955.pdf
    • http://jutemimiseg.epizy.com/ion_block_rocker_bluetooth_battery_replacement.pdf
    • https://uploads.strikinglycdn.com/files/cae30bb1-0e55-477c-be5e-722cc7e04230/how_to_be_vegetarian_as_a_picky_eater.pdf
    • https://s3.amazonaws.com/tutapaxi/76750348028.pdf
    • https://uploads.strikinglycdn.com/files/e59e8103-6a89-4f31-8cc8-63377dc5e837/harman_xxv_pellet_stove_manual.pdf
    • https://s3.amazonaws.com/xedewofuretujo/36350860715.pdf
    • https://s3.amazonaws.com/fifuto/report_burst_water_pipe_london.pdf
    • http://bigazixipiw.rf.gd/jarrahdale_guided_walks.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_off0000f070.bin
7264ddf24114012ce27118483bbaf84e1dd42a6f081c2ff386c24d9ecea6760e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF070 5448 bytes
font_01_sfnt_off0001030c.bin
149259fb3f90deae9aa23602275c507dad29db85ca7df809104639bbe83c90ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x1030C 11092 bytes