Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f5dd832f5baff4…

MALICIOUS

PDF

78.3 KB Created: 2021-05-06 07:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2a36eaea55e4e9843f613bfa845e3a10 SHA-1: a3be3ba50392104fccabce1b3faaf5704b4b8422 SHA-256: 57f5dd832f5baff43d2e0b5885f6802b759407bbbf9f5d9a7e880dbfd175e651
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://soxebez.ru/strik?utm_term=bradley+smoker+pucks+apple PDF link annotation
    • http://lafutib.sportsontheweb.net/inorganic_chemistry_chemical_bonding.pdfIn PDF document text
    • https://vipavogezeguw.weebly.com/uploads/1/3/1/0/131069860/7788472.pdfIn PDF document text
    • http://serururepus.scienceontheweb.net/gudukop.pdfIn PDF document text
    • https://cdn.sqhk.co/madozozafi/g9idJhg/1830743848.pdfIn PDF document text
    • https://cdn.sqhk.co/tikalijit/iegcCt4/nbc_sports_bay_area_giants_stream.pdfIn PDF document text
    • http://fejukoturig.medianewsonline.com/jabowepalinatebekomunuk.pdfIn PDF document text
    • https://runidodejifam.weebly.com/uploads/1/3/4/0/134040950/8950908.pdfIn PDF document text
    • http://kigurumi.org/domain_and_range_worksheet_secondary_25vwea.pdfIn PDF document text
    • https://gafokogem.weebly.com/uploads/1/3/0/8/130874161/1782850.pdfIn PDF document text
    • http://cosmeteca.com/488739563447y27x.pdfIn PDF document text
    • https://josozigigararu.weebly.com/uploads/1/3/2/6/132681886/ff0b204f50d.pdfIn PDF document text
    • http://nezowigivomi.scienceontheweb.net/91632947017.pdfIn PDF document text
    • http://copyrightnotice-ig.com/groove_life_camo_watch_bandsa0htt.pdfIn PDF document text
    • http://purubifo.medianewsonline.com/99010334966.pdfIn PDF document text
    • https://cdn.sqhk.co/mibajufaneja/UgeGDA2/grocery_shopping_tax_calculator.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/Wiejfij/kick_the_buddy_mod_apk_android_plus_1.pdfIn PDF document text
    • http://ramedefinu.getenjoyment.net/king_lear_act_1_scene_4_analysis.pdfIn PDF document text
    • https://cdn.sqhk.co/vobilurerire/ighc2hi/cha_cha_cha_dance_video_free.pdfIn PDF document text
    • http://drilltech.info/berloque_formatura_vivara_preo4tenv.pdfIn PDF document text
    • http://nitiwomifigurod.mygamesonline.org/82830170590.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/a75c2448-8661-49bc-bbdd-454cc01d30bf/indiana_pacers_latest_news.pdfIn PDF document text
    • http://lufopudizomuv.atwebpages.com/zalariwomego.pdfIn PDF document text
    • http://sajoveguduv.onlinewebshop.net/oxigenoterapia_en_pediatria.pdfIn PDF document text
    • http://nisetekotixob.myartsonline.com/700x_load_data_for_380_acp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aec8516-0d06-48c4-bdf3-e7c2feebe7da/7547385050.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 5436 bytes
SHA-256: d7772d1020139ce2bbe5348029759c8f53d2de0ad0de6b6eea961b6e199f5c00
font_01_sfnt_off0000efba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 11124 bytes
SHA-256: db5900eb5dcf5091d79b1993ff70dc2974855817adf0c0a92880d5d7699aa1f9
font_02_sfnt_off000115d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D5 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd