Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae68e660dbc597a4…

MALICIOUS

PDF

80.6 KB Created: 2021-05-01 16:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e40ce07e102a35d0cfb9706c73e5d36d SHA-1: 6806f332a98c6ae6e8f9265ab91c81f316c19e90 SHA-256: ae68e660dbc597a4b53db949cf32bc266ae24497187f131ad3153ccb9a3a537d
186 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 hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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=in+cold+blood+book+age+rating PDF link annotation
    • https://cdn.sqhk.co/sovanoniwuva/3ZSjghi/zigzagoon_evolution_pokemon_sword_and_shield.pdfIn PDF document text
    • http://creditactive.info/kenetekufixedikilezbuzfs.pdfIn PDF document text
    • http://lesantyqas.online/62243766645mv4lk.pdfIn PDF document text
    • http://vk-settings-change.online/reading_like_a_writer_francine_prose_summarycu890.pdfIn PDF document text
    • http://mebets.xyz/vetenategadaru1aqxb.pdfIn PDF document text
    • http://pannochki-art.com/sig_sauer_p229_inside_the_waistband_holsterb8sab.pdfIn PDF document text
    • https://cdn.sqhk.co/puxolika/fm6hdrK/photo_collage_apple_app.pdfIn PDF document text
    • http://ipai.online/mimimevowuviro7dyoi.pdfIn PDF document text
    • http://sberpodarok2020.online/nioh_character_skins4m699.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/uN7ZjeX/adidas_face_mask_restock_date.pdfIn PDF document text
    • http://save50.pro/shalom_aleichem_sheet_musicx9001.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/TahfDSd/70486258161.pdfIn PDF document text
    • http://usacreditreport.info/south_carolina_dmv_office_near_mep0g8b.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/aihb4ig/fajagitapabezixo.pdfIn PDF document text
    • http://gnfcns.info/64104725571kyz0p.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://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_20630071efae4b3a9b783d22fe6fd34a.pdf?index=trueIn PDF document text
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_423d690c6ae049bdbbb76acb0764a27a.pdf?index=trueIn PDF document text
    • https://dd91dc4b-d2fe-4aab-ab17-22023aa64d5b.filesusr.com/ugd/f05b1d_049560e548b64544b48fffc7eac89503.pdf?index=trueIn PDF document text
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_3f27d4bedffd4eda975eefd2a07dec2f.pdf?index=trueIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_e97b92bc0f69455d9cc756932434e397.pdf?index=trueIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_0c0bca2c93954515b1ae8f7f4311a38a.pdf?index=trueIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_b4ed163771844401a53f97e631aa1450.pdf?index=trueIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_fe749a01319d41bc95d1be8029d646ec.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF120 4860 bytes
SHA-256: 39e6af98f74b4f1755ad85a021f6f0d91ad48a890e1b8ec54b1b651e27dacb11
font_01_sfnt_off000101a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A3 10876 bytes
SHA-256: 625820793dce9c9acdb90b05f7bc3af4a595afde045ed629347946f63ed5b0cb
font_02_sfnt_off000126d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D7 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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