Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca82c26d9bcd9b2…

MALICIOUS

PDF

76.8 KB Created: 2021-05-09 16:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b624190b8149f1812b91788735df1aef SHA-1: 22c46b2ad754b02d57d1b47a307d9f7d639b7b2d SHA-256: 9ca82c26d9bcd9b2616f7a2e1159c2734182e25312c8cdf99475eeb1f0a32984
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including a link farm on disposable hosting, suggesting it is designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF structure point towards a phishing or malware distribution attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/strik?utm_term=beats+solo+pro+guide PDF link annotation
    • http://ryduslim.website/manual_de_reparacion_de_automoviles3k4ja.pdfIn PDF document text
    • http://zopevaxawoxe.22web.org/zonitavibuzisam.pdfIn PDF document text
    • https://cdn.sqhk.co/ramidazumiko/auShhHB/glory_road_lyrics_new_roses.pdfIn PDF document text
    • http://erethiztzj.space/asus_x205ta_ram_upgrade9ynft.pdfIn PDF document text
    • https://cdn.sqhk.co/vorinugobol/fZAidaS/catanzaro_informa_allerta_meteo_domani.pdfIn PDF document text
    • http://smirnoff-optic.com/bumavonizd990.pdfIn PDF document text
    • http://gafegenuwegapok.iblogger.org/bamodizazumesonenamaza.pdfIn PDF document text
    • http://sitajejo.22web.org/36956353530.pdfIn PDF document text
    • http://diviwisomos.22web.org/18514968165.pdfIn PDF document text
    • http://nukels.xyz/417560823078n3qz.pdfIn PDF document text
    • http://lodobinu.iblogger.org/bankruptcy_forms.pdfIn PDF document text
    • https://cdn.sqhk.co/bawijodol/gghjjiB/vomit_comet_nasa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/425d1b1f-5027-44f6-83e6-1a3d76298554/pidiwuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15e833e1-8725-498d-92ba-d2adcabdbea7/how_to_play_xylophone_sound.pdfIn PDF document text
    • http://vobununebufipu.rf.gd/latoxesepumolisigur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/615db105-6763-4e11-b91e-025bb3f0d738/cuanto_dura_la_metamorfosis_de_una_mariposa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f628edfe-ea6e-4e27-a778-ad4606f832c4/blackjack_basic_strategy_chart_hit_soft_17.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1232b9d3-4106-46cb-8499-7014f1a9b3f3/hp_laserjet_p1102w_setup_without_cd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc956e4c-d945-446a-8572-fd8bdb6c5039/how_to_play_binary_options_trading.pdfIn PDF document text
    • http://wazuvit.rf.gd/fomokajobosavip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1edc00fa-bc92-4981-bd71-8c205cf77984/86535775397.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95f83fdd-f45e-4ab8-b770-b7749456ccf0/somewhere_over_the_rainbow_ukulele_beginner_chords.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE28 5176 bytes
SHA-256: 1ee8d3331670e5b54f3c1858e9cabb98741a8fc9ba1e37e414a5bc2bf7cccd03
font_01_sfnt_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 11280 bytes
SHA-256: 2b19fcbdc673c1b2d1af6ebd1f3549cc210699b894505e96029801ad302a91f1

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