Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa550056a4cf6de…

MALICIOUS

PDF

95.2 KB Created: 2021-04-25 02:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 136e0a1f39886c3edc741cd96f8f463f SHA-1: 7886f9316dc9f0c875a9c843ca25d9cb3cae566b SHA-256: 0aa550056a4cf6de1b63118efc9f2967adeb1dc982d44a8bfde333b6fb154b38
196 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this file as malicious. The presence of embedded URLs and the heuristic for a password-protected archive lure suggest an attempt to trick users into visiting malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://gimoguvi.ru/strik?utm_term=baofeng+uv-5ra+programming+software+chirp PDF link annotation
    • http://frukt.space/ncaa_list_of_banned_substances_2019pv68y.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/ifhhQgh/slither_io_codes_2019_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/cgfaGii/pupudananiwed.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/0ic5Hha/jadon.pdfIn PDF document text
    • https://cdn.sqhk.co/sirazisiluz/QciAhib/epinoyload_app_download.pdfIn PDF document text
    • http://persequenteamsohbet.com/rival_automatic_steamer17xv9.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/EjjRKjW/poutine_meaning_etymology.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/thbgc90/98723222431.pdfIn PDF document text
    • https://cdn.sqhk.co/vebudirepo/sg39gj8/30266984129.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/iaCYvze/bujejatidetuvugavesoretar.pdfIn PDF document text
    • http://hookup673.site/394670241729ubch.pdfIn PDF document text
    • https://cdn.sqhk.co/ridijafugemi/oojg3hf/party_music_playlist_70s_and_80s.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/4haBjjd/retro_racing_game_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/bofake/vascular_malformation_face_icd_10.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/wemamimowaluzinexisapanun.pdfIn PDF document text
    • https://7605c768-a471-4169-85a9-0dab509fd250.filesusr.com/ugd/20ab23_7e6061544b504e8b910a13c7ee5b6c8f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bugutaj/90767993691.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/hack_version_of_asphalt_8_airborne.pdfIn PDF document text
    • https://6d0c6d30-55b9-4b7f-8145-34d11b484ddf.filesusr.com/ugd/8db56d_23ff03f56acf4f7ba8d48c13156dcf32.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dabatisew/xamewaboraxorebusumil.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/suwemoweroforizipo.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/68097454455.pdfIn PDF document text
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_5f90249016324b9b8d0f33a5d4fdf501.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zinudipir/78381035319.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/32299541063.pdfIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_2069dc7098bb447d84eec33079940175.pdf?index=trueIn 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_off000135b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B8 5752 bytes
SHA-256: f1f6c94022fedf8572455c6787d3b63f8a30dfff2c3b77af06924cb601d5549e
font_01_sfnt_off00014955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14955 11048 bytes
SHA-256: 0e02fadf8672ae26d8426fb95bcbee60224d8914a016631ab52c7dad533923f8

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