Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d7212851774647…

MALICIOUS

PDF

80.7 KB Created: 2021-06-05 10:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9bac9c16bb2185a8dec0c24bccd0a2d4 SHA-1: 45d6eb89e6f27fb7832e4097908ca00e7dec9351 SHA-256: 13d721285177464776f9c0644bbbb3e79c613dc4157d1fa0e655e2f822775859
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'chcial.ru', which is likely used to redirect users to a phishing or malware distribution site. The document body, though heavily obfuscated, contains text related to setting up an Amazon website, suggesting a lure to entice users to click the malicious link.

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://chcial.ru/pbw?utm_term=how+to+set+up+amazon+website PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408463/normal_5ff42f5fa9240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382638/normal_6042229f3da4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377371/normal_5fde3b2489bd5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuwofig.pbworks.com/f/kavuwi.pdfIn PDF document text
    • http://daridameku.pbworks.com/f/verokenokilupudukigowu.pdfIn PDF document text
    • http://nuxawakaxaz.pbworks.com/w/file/fetch/144497715/barbie_a_fashion_fairytale_full_movie_in_english_youtube_part_1.pdfIn PDF document text
    • http://zegugas.pbworks.com/w/file/fetch/144411402/98489508918.pdfIn PDF document text
    • http://niluputevi.pbworks.com/f/gomoxudeje.pdfIn PDF document text
    • http://fogofalo.pbworks.com/f/64694911186.pdfIn PDF document text
    • http://sonubugu.pbworks.com/f/not_so_boring_minuet_song.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/f/how_do_i_warm_up_leftover_pizza_in_the_oven.pdfIn PDF document text
    • http://beratirupo.pbworks.com/f/96064490713.pdfIn PDF document text
    • http://demopefo.pbworks.com/f/what_is_the_meaning_of_the_word_husna.pdfIn PDF document text
    • http://jebodigezev.pbworks.com/w/file/fetch/144524331/65954686031.pdfIn PDF document text
    • http://damopijos.pbworks.com/w/file/fetch/144526422/ver_si_el_imei_esta_reportado_ecuador.pdfIn PDF document text
    • http://ziludezubeju.pbworks.com/f/la_noche_oscura_del_alma_meaning.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/f/30736289856.pdfIn PDF document text
    • http://pilujibos.pbworks.com/w/file/fetch/144604290/41980562680.pdfIn PDF document text
    • http://gogoporiwo.pbworks.com/f/how_to_calculate_the_weight_from_volume.pdfIn PDF document text
    • http://xumefosux.pbworks.com/w/file/fetch/144578445/august_2020_sat_answers_reddit.pdfIn PDF document text
    • http://gabekujijud.pbworks.com/f/2015_vw_tiguan_service_schedule.pdfIn PDF document text
    • http://pezeliv.pbworks.com/w/file/fetch/144423570/43012711863.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_off0000fcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD4 5080 bytes
SHA-256: 9cbd21d080d8e8f7c76a7dcc8758870a88182ad3965b55d4533131b5eb0ed623
font_01_sfnt_off00010e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1E 11500 bytes
SHA-256: 3c1a2099fb9a2c7099c4e8207a60689cb5c71eec4badd0f60d3fe6fb975b865c

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