Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f4484fd2e58c81…

MALICIOUS

PDF

77.0 KB Created: 2021-04-30 07:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a56161fd48a3fb7ec3946cd662282444 SHA-1: 7d48e4c31b30c5e28897988665cdb7b44d636227 SHA-256: d4f4484fd2e58c8156a5148ec2fe9b1465593e08660f1ce8e69fadbcf8269f9b
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm or phishing lure, as indicated by the high number of external links, many hosted on disposable domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or exploit vulnerabilities. No scripts were extracted, but the structure and URL patterns point towards a phishing or redirection attack.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=how+to+turn+on+live+traffic+google+maps
    • http://mawosatejojeka.sportsontheweb.net/advanced_cardiac_life_support.pdf
    • http://tozofuji.scienceontheweb.net/merge_two_word_docs_to.pdf
    • http://fijexojor.getenjoyment.net/support_vector_machine_books_free_download.pdf
    • https://nolaguga.weebly.com/uploads/1/3/4/3/134307058/756302a8.pdf
    • http://zodimasar.mypressonline.com/sarubupelegakuka.pdf
    • http://nariwunuzaw.scienceontheweb.net/barron_s_sat_prep_29th_edition.pdf
    • http://dapurixid.sportsontheweb.net/bolted_connection_nptel.pdf
    • https://ritixalasan.weebly.com/uploads/1/3/4/2/134265532/pebale_xivewapimeriros_budori.pdf
    • http://xuzobinemipivor.mygamesonline.org/bathroom_designs_for_home.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_981e21a4f73a4a8b900e28576d7c7025.pdf?index=true
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_a894f6c50f004ab9984137c99158e49b.pdf?index=true
    • https://574dee49-ee40-4737-ae02-340ce2b26f9d.filesusr.com/ugd/b44cf7_65398a91eebd4a2e871de3cfeda13171.pdf?index=true
    • http://romakilax.myartsonline.com/babylonian_prayers_to_marduk.pdf
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_c660da27830a46caa0a552f22ce0823b.pdf?index=true
    • http://lavisekenesavof.myartsonline.com/abstract_reasoning_questions_and_answers.pdf
    • https://s3.amazonaws.com/vitelitubovuluj/46328564369.pdf
    • https://s3.amazonaws.com/sakaburepagase/75914189005.pdf
    • https://s3.amazonaws.com/xowasosuf/jack_reacher_in_order_films.pdf
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_970cfb4856a94ec687dfd75c3d4eeb42.pdf?index=true
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_7ef9b10d8beb4905b15ec88c2e384b81.pdf?index=true
    • 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_off0000ed64.bin
9597cc6f190ef963c509418de47fc548baf8d5a2b2a33d30e54d01933c11c945		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 5448 bytes
font_01_sfnt_off0000fff2.bin
aac10df02e17a59b645283257a51e94cddca4ca69108ab11b57f8cb6515731a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF2 11336 bytes

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