Malicious PDF — malware analysis report

Static analysis result for SHA-256 281a023ed6db5e47…

MALICIOUS

PDF

70.5 KB Created: 2021-03-30 09:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fedbe4a36b63d1241b9861641eff8522 SHA-1: 22780445372e4250ecd351e2190ba429f2333947 SHA-256: 281a023ed6db5e47e524b3ae82f423d977cde41b7c414a189dc3fb0e6693f1be
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that points to a suspicious domain, identified by ClamAV and a machine learning classifier as malicious. The document body appears to be corrupted or obfuscated, but the presence of the external URI and the high ML score strongly suggest a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitated the embedding of the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=rehras+sahib+fast+mp3+download+djpunjab
    • https://cdn-cms.f-static.net/uploads/4365555/normal_6019c5d8d61db.pdf
    • http://birabaguperije.iblogger.org/jenis_jenis_metode_blanching.pdf
    • https://static.s123-cdn-static.com/uploads/4473375/normal_5fc691d0e53c4.pdf
    • https://cdn-cms.f-static.net/uploads/4402250/normal_605340aebe4ef.pdf
    • https://static.s123-cdn-static.com/uploads/4389576/normal_5fee0f9d54f4c.pdf
    • http://bit7.top/disowixefowefotjk9nr.pdf
    • http://heliusdesign.ru/synology_ds918_quick_start_guidechzum.pdf
    • http://xidijisuf.22web.org/what_genre_is_maximum_ride.pdf
    • https://static.s123-cdn-static.com/uploads/4476302/normal_5fcbe284e0775.pdf
    • http://xtreme-sport.ru/besupizanopagimovugadakoa9k.pdf
    • http://osthondroz.com/the_disaster_artist_filmscoop6tgue.pdf
    • https://cdn-cms.f-static.net/uploads/4455380/normal_5fd09d724ba81.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vaxerow.epizy.com/simile_and_metaphor_worksheets_for_4th_grade.pdf
    • http://rubonemim.epizy.com/how_to_add_value_to_yourself.pdf
    • https://s3.amazonaws.com/jamuluvuvava/26677256941.pdf
    • http://gazezubutajon.rf.gd/bangladesh_album_video_song.pdf
    • https://s3.amazonaws.com/vazisi/bulbul_film_hd_video_songs.pdf
    • http://lokuvutifinulef.rf.gd/chelsea_fc_injury_report.pdf
    • http://pilojoduzige.epizy.com/good_country_2_step_music.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c98f.bin
386490ac96c730eb79fb82f70251f48d9b8cdf557f9d20107ec3b6f98de8c06b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC98F 5644 bytes
font_01_sfnt_off0000dca4.bin
6f92339e5c0ffe473ee22f60956a0f27afd6bcebc532727545c3c79ff18b032b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA4 9784 bytes
font_02_sfnt_off0000fe12.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE12 4324 bytes