Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ed9751950f8776…

MALICIOUS

PDF

75.3 KB Created: 2021-04-04 13:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7973656f304791ea293b7f918bc1b1a5 SHA-1: 54da4c4391f1ecfd3a39041c8510d23018a41f7f SHA-256: 81ed9751950f8776037baa89a9c6385f51653e19f23fe49685c6d2f1a051b8d1
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URL points to a domain associated with malicious activity, and the document body, though partially corrupted, contains text related to 'cronbach's alpha' which appears to be a lure. No scripts were extracted, but the presence of an external URI suggests a phishing or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/strik?utm_term=how+to+increase+cronbach%2527s+alpha
    • https://static.s123-cdn-static.com/uploads/4471092/normal_5ff0a66d031ca.pdf
    • http://pigigozoruda.mypressonline.com/1110595937.pdf
    • https://static.s123-cdn-static.com/uploads/4494891/normal_5fee9f963cbb5.pdf
    • https://cdn-cms.f-static.net/uploads/4459323/normal_603c391692557.pdf
    • http://aydym.club/vex_iq_parts_postervkrpp.pdf
    • http://revershjtb.site/how_to_setup_hp_officejet_4500_wireless_fax0femx.pdf
    • http://airet.space/15713262026oddam.pdf
    • http://vumogegotawugub.mypressonline.com/think_like_a_freak_chapter_3_summary.pdf
    • https://cdn-cms.f-static.net/uploads/4413713/normal_6041a9aa0118a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/36f062e1-e9f4-45cc-8b4e-156432c967f9/educational_employees_credit_union_merced.pdf
    • http://puzenufamem.rf.gd/algebraic_topology_notes.pdf
    • http://sisawujeza.rf.gd/pitofojapobonen.pdf
    • https://s3.amazonaws.com/getizar/gertrude_s_cat_quick_guide_rs3.pdf
    • http://fusozevukatamir.atwebpages.com/29472942407.pdf
    • http://misovin.epizy.com/fonig.pdf
    • http://dexivovadoxexo.myartsonline.com/1501502319.pdf
    • https://uploads.strikinglycdn.com/files/e83dafb3-e211-4b2c-8cf0-5d0b685c5af3/20602112745.pdf
    • https://uploads.strikinglycdn.com/files/52174392-6e91-4f28-bc7e-215274b4f6c9/allen_bradley_powerflex_700_manual_series_b.pdf
    • http://gakilasefit.myartsonline.com/holmes_tower_quartz_heater_with_max_flow.pdf
    • https://s3.amazonaws.com/baposivarabuj/lidimepikore.pdf
    • http://detevosozibago.epizy.com/candelario_obeso_poemas.pdf
    • https://s3.amazonaws.com/toguvaju/goblin_dawn_of_the_dead_soundtrack.pdf
    • https://s3.amazonaws.com/vukumesoj/pink_glitter_wallpaper_free.pdf
    • http://bizijituluwod.rf.gd/35195994601.pdf
    • https://s3.amazonaws.com/nunakixuma/rovafananunutumosatizede.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_off0000e864.bin
0ad0145e5152239a39ce06b5c6483ce6b788baec890197aa24bf1ca5bb5fc305		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE864 5248 bytes
font_01_sfnt_off0000fa4a.bin
46482fc6c95cf43d71c273185932da90f2de3356db9d771ada485ad2dae6033f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4A 11112 bytes

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