Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5f0408d9f13e83…

MALICIOUS

PDF

101.2 KB Created: 2021-03-06 00:37:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4a11a0d2b13ada4626e20edebda0dc6e SHA-1: 14a49ac0144637dc31eecac2fb8ae6037e95cfdd SHA-256: 8c5f0408d9f13e83a300a10267c6465a551c5f3fd3fb1c7b9724b4eaf72fbacd
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 pointing to disposable domains, indicative of a link farm designed to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are consistent with SEO poisoning and phishing campaigns.

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
  • 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://botokaw.ru/wix?keyword=andrew+chang+tennis PDF link annotation
    • https://cdn.sqhk.co/tomubozes/b3UCZii/guess_my_age_2020_settembre.pdfIn PDF document text
    • https://cdn.sqhk.co/wezupobuwab/eOvLiin/zombie_offroad_safari_hack_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/hhlLlgh/51888697566.pdfIn PDF document text
    • https://cdn.sqhk.co/gukawaki/dyRyfgh/kuwexubisomitu.pdfIn PDF document text
    • http://how2clever.com/dr_seuss_how_the_grinch_stole_christmas_full_movie_free_downloadwqk2k.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/316271689871pzei.pdfIn PDF document text
    • http://hookup681.site/gupamuzebarijaniguxegu7j2cq.pdfIn PDF document text
    • https://cdn.sqhk.co/pulazapusaw/jN9hhjg/zuner.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzipogowita/ejdcHib/73604751078.pdfIn PDF document text
    • http://help-mediasupport.com/hitchhiker_s_guide_to_the_galaxy_movieg909l.pdfIn PDF document text
    • http://podarokinsta.online/what_is_the_functional_analysis_in_sociology862ki.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/i9Jgjje/jazurowa.pdfIn PDF document text
    • http://rekugegik.scienceontheweb.net/49055796503.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/chggcck/mi_home_launcher_apk_free_download.pdfIn PDF document text
    • http://mumijivamivaxij.medianewsonline.com/nexoxutawoligagomewim.pdfIn PDF document text
    • http://vizudawu.22web.org/eureka_math_grade_8_module_2_lesson_15.pdfIn PDF document text
    • https://cdn.sqhk.co/zupololano/igyUEic/63630012933.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/english_grammar_in_use_supplementary_exercises_with_answers_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_0c15b9ea1ad840c78b555c401b72a5e9.pdf?index=trueIn PDF document text
    • http://zezajezo.epizy.com/github_create_template_repository.pdfIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_2e200f22e0f746f782ee41a51ac28cbe.pdf?index=trueIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_6e9db992501047e9a8bddb4253d3589c.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_off00012b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B17 5696 bytes
SHA-256: f72b2dc2073d0391f8b1502cab319eeee728e4d84e561bc9d1813aedd27d436d
font_01_sfnt_off00013e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8F 5252 bytes
SHA-256: 0d4880a7dff7820f6e267485312181419786bfebb0e2ee67825beea800471b14
font_02_sfnt_off00015078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15078 18092 bytes
SHA-256: c171d526f1ec9a1e011f463cc88123f5039c435b3e0b45fd73c1e3d1af43294d