Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe53d8db0a0b042…

MALICIOUS

PDF

86.7 KB Created: 2021-04-02 09:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: aaa98fdf772247f6025e5a71e17701ee SHA-1: c62e9aef0ca195a28fb8dcc1a3fe73c6e4263fea SHA-256: efe53d8db0a0b042da2d3dba44cd933440a827315bff8c88674531331f5b1b64
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were explicitly extracted, the malformed stream length and ML classifier output suggest exploitation is present, likely leading to the execution of malicious code or redirection to attacker-controlled sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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=mastery+robert+greene+full+book PDF link annotation
    • http://zibodotuf.mygamesonline.org/catalogo_avon_campagna_14.pdfIn PDF document text
    • http://gudutisiluzew.mypressonline.com/what_are_the_main_criticisms_of_humanistic_psychology.pdfIn PDF document text
    • http://irisca.online/origami_box_out_of_rectangle_paperbjgqo.pdfIn PDF document text
    • http://prolac.ru/antibiotic_prophylaxis_guidelines_after_joint_replacement693ac.pdfIn PDF document text
    • http://snapchat-alert.com/535531864116zyoz.pdfIn PDF document text
    • http://acupofjacob.com/292236667711iie7.pdfIn PDF document text
    • http://yachts-4-sale.com/zigevadabatevurxarh1.pdfIn PDF document text
    • http://metarapuw.mypressonline.com/anabolisme_adalah.pdfIn PDF document text
    • http://mishabelle.ru/pabusofusumonalekafok8hqvt.pdfIn PDF document text
    • http://hookup668.site/manual_ip_address_printer5lvk4.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/mifodajobogakonifiverajvkno.pdfIn PDF document text
    • http://mogisut.medianewsonline.com/20835023161.pdfIn PDF document text
    • http://alcozerox.com/yamaha_arius_ydp_143_manual4f07m.pdfIn PDF document text
    • http://therarbooks.com/daycare_business_plan_template_free_downloadb3jnt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_b6b056267bb343df9ae60d4e49d57164.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3564b2fd-93a5-4724-916f-2dc8212a78f5/what_are_the_term_dates_for_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69af6613-6aa9-4a01-8044-cc9d0e746b18/18366578603.pdfIn PDF document text
    • http://sanugifop.atwebpages.com/28439413150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75cea4bc-c4ef-4fb6-8b06-6a1cecf49016/metal_gear_solid_v_the_phantom_pain_all_playable_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f88985a5-359d-4911-af26-e932fccc70c6/city_of_pittsburgh_building_code_violations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31f0e6b2-99bd-4d36-b8b5-fef92f4b9609/android_app_development_course_fees_in_chennai.pdfIn PDF document text
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_5b80399b32874c1f99d43927c0fca977.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/19ab16a1-075a-4cdc-8895-257ba6077688/78243969954.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_off000117cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CB 5244 bytes
SHA-256: db13e6954af8031ce42c197762f8edb7a0e31205b0fce71296e475236d691fde
font_01_sfnt_off000129ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CE 10392 bytes
SHA-256: 2484ac61d3477b22d19de0490fcfc61473ae22b58c8e2902dba39e42926865b0