Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ec1273034aac93…

MALICIOUS

PDF

84.8 KB Created: 2021-01-25 19:30:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3a69949e1e002277e0bce99511d96292 SHA-1: 9a19a0c515b2a0f6e4657c3f85e60761bef3b780 SHA-256: b8ec1273034aac93bc9370b55d3ab1ac171d3aab9d40edaa8f87711aa3f5919d
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/aws?utm_term=youcam+perfect+camera+app++for+laptop PDF link annotation
    • http://drilltech.info/tolumedokekolugojulojamb8oel.pdfIn PDF document text
    • http://stalekost.site/map_among_us_skins_free_mobile9mvzh.pdfIn PDF document text
    • http://juniwasobevi.22web.org/37232997151.pdfIn PDF document text
    • http://trend-sales.fun/54497955450fqk52.pdfIn PDF document text
    • http://daimontimur.org/titudinalugec6alk.pdfIn PDF document text
    • http://4kuhd.me/23702328293bc3hc.pdfIn PDF document text
    • http://iwhite.space/foxyland_ps4_trophies12ufa.pdfIn PDF document text
    • http://dutov.org/strange_world_offline_survival_rts_games3k32.pdfIn PDF document text
    • http://onlinetiser.website/best_claw_machine_arcade_near_mehb9bs.pdfIn PDF document text
    • http://gamedv.design/kitizibenuv62qd.pdfIn PDF document text
    • http://galoomer.online/best_buy_ps5_launch_day_pickupho76b.pdfIn PDF document text
    • http://fdvsefwfrw.space/dark_quest_2_achievement_guideo9422.pdfIn PDF document text
    • http://peroruse.iblogger.org/gnossienne_no._3_sheet_music.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gozifep/balu_mahi_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/android_english_dictionary_api.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/kayn_guide_karasmai.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/42001652368.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF53 6588 bytes
SHA-256: 746cda19d0a45b0d6108c63ff8192b2f88c2fff5e5937e692a7cb04b31166607
font_01_sfnt_off0000ef9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 2952 bytes
SHA-256: 18f3dad90f0b8a749557125039a501166b605b51d41492c5c2dfd7e147c8bf53
font_02_sfnt_off0000fa2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2B 4944 bytes
SHA-256: d35952cc5f01a90993ffe37937225daef9570a71ea448f4438be2f92fa5d4fbc
font_03_sfnt_off00010aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AED 10660 bytes
SHA-256: c453b922bd103208dd36a27b8607379bc107483184092e3ee53389f1d3659dff
font_04_sfnt_off00012f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9A 16092 bytes
SHA-256: 956bd9f88d2002ae4d8912728d8614d0a8e21194bf5b6a01accc3d37d7402fbf