Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a38942fa108d9d…

MALICIOUS

PDF

82.1 KB Created: 2021-03-22 05:26:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: fa58f06f9f9d4705ef95d426b3b024e8 SHA-1: 68dad69807faa83fdfd1c3a9581635bc30de6c69 SHA-256: 12a38942fa108d9d883e767e7a62e0e47615dcb734704110bd0869259b738a31
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to SEO-optimized PDF files hosted on disposable or suspicious domains, indicating a link farm designed to redirect users. The presence of a known malicious redirector URL and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=bipin+chandra+history+book+for+upsc+pdf In PDF document text
    • http://miludigava.22web.org/formula_tab_in_excel.pdfIn PDF document text
    • https://rolewexuvuviwu.weebly.com/uploads/1/3/4/7/134742390/4119531.pdfIn PDF document text
    • https://lafasajuju.weebly.com/uploads/1/3/4/0/134017903/7150758.pdfIn PDF document text
    • https://zesakexe.weebly.com/uploads/1/3/5/3/135314388/gozivojatenufad.pdfIn PDF document text
    • https://tozovugoji.weebly.com/uploads/1/3/1/6/131606343/4119778.pdfIn PDF document text
    • http://vofefipegurixu.iblogger.org/el_espiritu_de_dios_esta_en_este_lugar_acordes_piano.pdfIn PDF document text
    • https://jijaxiwiruba.weebly.com/uploads/1/3/5/3/135333012/sukoz.pdfIn PDF document text
    • https://tilejawerez.weebly.com/uploads/1/3/4/7/134709016/kilimajapubiw.pdfIn PDF document text
    • https://liletalezawo.weebly.com/uploads/1/3/4/5/134591830/d9ad723d91f.pdfIn PDF document text
    • https://tenivutod.weebly.com/uploads/1/3/1/0/131070705/rimel.pdfIn PDF document text
    • https://gewaxuselez.weebly.com/uploads/1/3/4/2/134265722/kanidi.pdfIn PDF document text
    • http://rufefoj.iblogger.org/tencel_sheets_meaning.pdfIn PDF document text
    • http://fijubigatusurov.scienceontheweb.net/dagorekelef.pdfIn PDF document text
    • http://lerimofo.mywebcommunity.org/accounting_process_philippines.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_c9402a67724747ae936cc0928fddd91e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/list_the_first_6_cube_numbers.pdfIn PDF document text
    • http://zusobudem.epizy.com/lipids_worksheet_answers.pdfIn PDF document text
    • http://zasuwunal.myartsonline.com/rediri.pdfIn PDF document text
    • http://nowageg.onlinewebshop.net/pdf_to_word_converter_download_for_windows_10.pdfIn PDF document text
    • https://fec450ea-b80f-4746-b851-35139cc02de5.filesusr.com/ugd/53a83b_c1261dd4b14b46b1b189460ebf50abe3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wurivuve/paint_the_town_red_steam.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/attorney_website_template_free.pdfIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_95b014f7a65245a6af6cd47f05f6a88e.pdf?index=trueIn PDF document text
    • http://wonanikapudidak.atwebpages.com/14372992730.pdfIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_4ad843afb6e54aca89ac0e6d94d19c7f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/24103914372.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_off0001017c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 5564 bytes
SHA-256: 1f258efc09bf5d9bd33b508e02c654be7a420c2294e1b29fcc4d72323e6450f6
font_01_sfnt_off0001146b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146B 11036 bytes
SHA-256: 4a1350a9f2893db65493db92a4b96b647e3c617d4c4ad947c2ef61c248d8bcb8