Malicious PDF — malware analysis report

Static analysis result for SHA-256 f70b5813f0695323…

MALICIOUS

PDF

79.2 KB Created: 2021-03-25 05:03:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 502e90bccba7cccf264bb949ca7881c9 SHA-1: db1a1409846d8466f195c7708a409547e030dd8d SHA-256: f70b5813f0695323a654edfc3fa319ba51c04f8211224fc1995b7262f8ffd239
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=central+vs+peripheral+vertigo+causes PDF link annotation
    • https://cdn.sqhk.co/xurazegoba/hiibicf/84066432257.pdfIn PDF document text
    • https://cdn.sqhk.co/lunabati/gr9haW4/ben_10_omniverse_alien_run_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/hfnGkS7/woodworking_plans_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/bodorosuzuta/0haiySf/ludijawimodemazazi.pdfIn PDF document text
    • http://korogesubelokut.mypressonline.com/lefab.pdfIn PDF document text
    • https://cdn.sqhk.co/fejavegiwo/gfpgfCv/stack_smash_helix_ball_blast_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/ludukuni/1HjbjhJ/visit_florida_commercial_song.pdfIn PDF document text
    • http://konolux.medianewsonline.com/33331234075.pdfIn PDF document text
    • http://vibolofisef.mywebcommunity.org/deficincia_de_vitamina_k.pdfIn PDF document text
    • http://fimunukowira.iblogger.org/mazudamuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tazopaju/sluice_gate_valve_data_sheet.pdfIn PDF document text
    • http://demunoj.epizy.com/votoputodeb.pdfIn PDF document text
    • http://wuxojawe.epizy.com/hcl_apprentice_online_form_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/employment_news_13_october_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/agneepath_movie_video_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/7229742189.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/11919763082.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/nubezib.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAA 5160 bytes
SHA-256: df4d659420254aef714cacb629e5029a66ccedc2f09410d9ab47078ddd4b8b49
font_01_sfnt_off0000fe3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3A 10216 bytes
SHA-256: 7c30f8815d11d7bef877eaaa02c701cbb574ee4855f28ea0e76812842432024e
font_02_sfnt_off000120fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FA 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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