Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8637f2c77ddddc…

MALICIOUS

PDF

73.6 KB Created: 2021-04-23 06:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7602f39dfd2cd82ec502f7b2c92229a SHA-1: 7b140af3a86a01689e2aa632f5de3dfe91a37b23 SHA-256: bc8637f2c77ddddc9d24325e67ce0dfb96d62892b943420f00e883d88e386a59
136 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, with heuristics indicating the presence of external URIs and embedded URLs. The document body, though truncated, suggests a lure related to 'Phases of mitosis worksheet answers', which is a common tactic for phishing or malware distribution. The embedded URLs likely lead to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://zajinet.ru/strik?utm_term=phases+of+mitosis+worksheet+answers
    • https://cdn.sqhk.co/gebitasixa/gEfvlP0/fusuletoxiwol.pdf
    • https://goxanakevixi.weebly.com/uploads/1/3/4/8/134857001/vuvevo.pdf
    • http://idealslimitalia-oficial.site/how_to_program_my_xfinity_remote_to_my_samsung_smart_tvob7aw.pdf
    • http://d-youtube.com/tumulunowapybjp.pdf
    • https://cdn.sqhk.co/xonoguduzob/Ik0ihlE/bus_simulator_2015_old_version_apk_download_apkpure.pdf
    • http://tertov.xyz/28848660335qtqd3.pdf
    • https://cdn.sqhk.co/bexuxoxabim/he5Aijc/banco_bradesco_codigo_doc.pdf
    • http://alcexpress3.xyz/curl_of_gradient_of_vector_field3mabd.pdf
    • https://cdn.sqhk.co/jumunuji/IWIpgix/nasal_cavity_anatomy_bones.pdf
    • https://cdn-cms.f-static.net/uploads/4381091/normal_5fd8372fb9bc3.pdf
    • http://price-list.moscow/diffusion_of_innovation_rogerspiq25.pdf
    • http://b0xberry.online/natural_b_complex_amwaynrhuz.pdf
    • https://cdn-cms.f-static.net/uploads/4405409/normal_6038b5d3cf4e8.pdf
    • http://teachost.com/great_northern_popcorn_machine_popping_instructions7uudq.pdf
    • http://stakingyfi.com/furukisubivemakulilusaon72t.pdf
    • http://cardioactiveitalia.site/what_is_the_best_sewing_machine_for_home_use6dt8x.pdf
    • https://zegaturivelegob.weebly.com/uploads/1/3/1/4/131437779/903b09a853e2c0.pdf
    • https://cdn-cms.f-static.net/uploads/4481527/normal_5fdc793b55588.pdf
    • http://fsfsfd.xyz/correlative_conjunctions_worksheetnudnm.pdf
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/vubiwi.pdf
    • https://static.s123-cdn-static.com/uploads/4409239/normal_5ffea394186f6.pdf
    • http://praktika-ingenieur.com/airbrushing_techniquesvobo4.pdf
    • https://galofufe.weebly.com/uploads/1/3/1/3/131384583/xowijuv.pdf
    • https://cdn.sqhk.c
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000e576.bin
01b6031149f333798a27f94e8cfce8e5b7048b8540d74513336f44fbb88a42f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 5132 bytes
font_01_sfnt_off0000f6d2.bin
30fb3c824dd2d30dccafd8b4a67cf98814924c559dcf62fb91ef50186f6890ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D2 9964 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.