Malicious PDF — malware analysis report

Static analysis result for SHA-256 95cc9bb5441b9e8b…

MALICIOUS

PDF

75.4 KB Created: 2021-05-20 13:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61aad43e7c232d53837d638aed763453 SHA-1: 0f777d252520bb4e97b5a5772e30d766b4eff6cf SHA-256: 95cc9bb5441b9e8b20213a08eddbdc1190508c7803a5e3bbb826b77d8511c308
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains or services like Weebly and S3, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of numerous external links, including one with a 'strik' parameter, supports the attack pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://gimoguvi.ru/strik?utm_term=what+does+bisou+bisou+mean
    • https://sefewazugep.weebly.com/uploads/1/3/5/2/135293251/kurixekajud-wowetutejixot-wurasuvatonesu-saxulaxem.pdf
    • https://taxudomajifi.weebly.com/uploads/1/3/4/1/134108655/navitepiwi.pdf
    • https://molawaxurot.weebly.com/uploads/1/3/4/6/134699933/8484b0f0de.pdf
    • https://muzezibabut.weebly.com/uploads/1/3/0/7/130739211/xogopumubi.pdf
    • https://delezebewokumod.weebly.com/uploads/1/3/0/7/130776218/savolem_ritixatufi_zapewafuretel.pdf
    • https://puxofigu.weebly.com/uploads/1/3/5/3/135347112/gijevijiwaxu-poloxuxogoxinu-tubiver.pdf
    • https://vosanuxavuzom.weebly.com/uploads/1/3/6/0/136089669/telatiwigitezikedoru.pdf
    • https://lajojixuvoporor.weebly.com/uploads/1/3/0/7/130738555/vinakonu-juroler-pasegosuguzef.pdf
    • https://famimiketavow.weebly.com/uploads/1/3/0/8/130873946/4751044.pdf
    • https://tobemokopa.weebly.com/uploads/1/3/0/7/130776516/lukugaxofonapapax.pdf
    • https://tatonipek.weebly.com/uploads/1/3/4/8/134874136/lopoji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lerezazo/bonilozasojog.pdf
    • https://uploads.strikinglycdn.com/files/411204ea-1fba-4aae-9af2-955b4137e839/what_reading_level_is_diary_of_a_wimpy_kid_hard_luck.pdf
    • https://s3.amazonaws.com/vebisop/759092756.pdf
    • https://uploads.strikinglycdn.com/files/41bfc62e-7cc3-4bc6-934b-e9b1548a211b/grade_4_math_textbook_ontario.pdf
    • https://s3.amazonaws.com/vazisi/what_is_code_sud_on_samsung_washer.pdf
    • https://uploads.strikinglycdn.com/files/be755c2d-d659-44e5-b9b9-3b2007a42e6f/how_long_to_cook_a_15lb_turkey_on_big_green_egg.pdf
    • https://s3.amazonaws.com/ginutu/old_school_cars_for_sale_memphis_tn.pdf
    • https://s3.amazonaws.com/mojivikapeti/art_history_major_university_of_chicago.pdf
    • https://s3.amazonaws.com/wopari/filavanixoketip.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea45.bin
dbe37346129b4abf8bc1f96ea021b049d031f87808bf7116d5f0eaf93e0d7452		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 5092 bytes
font_01_sfnt_off0000fb76.bin
17bc7aee353c386c0489b3059f0af386cb39eb99040a09ebeff5083d430ad822		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB76 11296 bytes

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