Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef88a2d8ae55062e…

MALICIOUS

PDF

72.1 KB Created: 2021-03-20 22:55:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6509ef4cf092eb03c3041e275d7a4756 SHA-1: 503a6354e81e20d1b68ed46f419bb064435eab13 SHA-256: ef88a2d8ae55062e936f4b3a0b57e1de8dfcac5a242f28258959e897632b8f27
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to a biological query, suggesting a social engineering tactic.

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://nipisod.ru/aws?utm_term=what+are+the+duplicated+strands+of+dna+called
    • https://cdn-cms.f-static.net/uploads/4480884/normal_6055015f48807.pdf
    • http://lakcherie.ru/how_to_turn_off_demo_mode_on_panasonic_inverter_microwaveggbgp.pdf
    • https://cdn.sqhk.co/zodavujera/dhdibjb/662829898.pdf
    • https://cdn-cms.f-static.net/uploads/4373757/normal_600e73b870199.pdf
    • http://vodizurulenega.mypressonline.com/middle_school_vocabulary_list.pdf
    • https://cdn-cms.f-static.net/uploads/4474205/normal_601fa1f282fdf.pdf
    • https://cdn-cms.f-static.net/uploads/4369310/normal_600d62130cf9f.pdf
    • https://static.s123-cdn-static.com/uploads/4368971/normal_5ff10a3a34983.pdf
    • https://cdn-cms.f-static.net/uploads/4368951/normal_6035448abad17.pdf
    • http://zuxemesemubozo.mywebcommunity.org/18325485215.pdf
    • https://cdn-cms.f-static.net/uploads/4457320/normal_6015f3c3e4cf3.pdf
    • https://static.s123-cdn-static.com/uploads/4490364/normal_5ff240ad8d40d.pdf
    • http://wellwork.site/download_mangao6yd1.pdf
    • http://fastpysystem.online/fallout_4_fusion_core_codel3q52.pdf
    • https://static.s123-cdn-static.com/uploads/4416496/normal_5ff8bafad2d6d.pdf
    • http://igclienteam.com/harrisons_principles_of_internal_medicine_18th_edition_free_download4n17d.pdf
    • https://static.s123-cdn-static.com/uploads/4487918/normal_6000fe3fc4051.pdf
    • http://gakmancreatures.ru/28199091921f1bc9.pdf
    • https://cdn.sqhk.co/rorezina/hdghbjc/vuzudamezoginusojigov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/musoxifuvitalo/81008006543.pdf
    • https://s3.amazonaws.com/vuforewebub/zonavigi.pdf
    • https://s3.amazonaws.com/sowewazulejewi/vebataleketadevibiboxex.pdf
    • https://s3.amazonaws.com/lanorolowu/bajapiwofevatikivo.pdf
    • https://s3.amazonaws.com/vososasoxumete/zefix.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_off0000de42.bin
3d631e849e9aa901584e15a83806587185377c7f0fb67e35085c626ebe1f08b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE42 5256 bytes
font_01_sfnt_off0000f028.bin
83686ac7db4f5dd9ad50ba0d5f5dbe5a3990d482dd5df66768648717fb292f84
pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 10080 bytes