Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d20e6a84a6c7ce…

MALICIOUS

PDF

75.4 KB Created: 2021-05-16 15:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 1cb7975a8eec0338349bd630f8b93ea2 SHA-1: 2fedf448062cec51e80df120340bb9ab0ae622aa SHA-256: f6d20e6a84a6c7ceb8b42e3d593c3dd7598d656d5eeb9be94f9c13cafe26522b
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, suggesting a link farm or phishing campaign. ClamAV detected the file as 'Pdf.Phishing.Trojan', and ML classification yielded a high probability of maliciousness. The embedded URL 'https://xezojetit.ru/strik?utm_term=after+book+3+read+online+free' is a primary indicator of the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xezojetit.ru/strik?utm_term=after+book+3+read+online+free PDF link annotation
    • http://ruxuzosok.mywebcommunity.org/83482204959.pdfIn PDF document text
    • http://kokolonesafu.getenjoyment.net/rumeketo.pdfIn PDF document text
    • http://fopokigife.mywebcommunity.org/45540133427.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/calories_in_indian_food_chart.pdfIn PDF document text
    • https://sonikimejikelo.weebly.com/uploads/1/3/2/6/132681145/d6a7a5.pdfIn PDF document text
    • http://mudikovarew.mygamesonline.org/945236731.pdfIn PDF document text
    • https://turakenedonatup.weebly.com/uploads/1/3/4/6/134610331/jotuvizukatole.pdfIn PDF document text
    • http://bisapusid.mypressonline.com/3_branches_of_government_worksheet.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/oreilly_python_books.pdfIn PDF document text
    • http://pelubexeto.getenjoyment.net/65013835166.pdfIn PDF document text
    • http://wedevaz.sportsontheweb.net/reflection_and_refraction_of_light_class_10_notes.pdfIn PDF document text
    • https://belanuxaru.weebly.com/uploads/1/3/4/6/134670531/783e3d37c7846.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_8cd54874670946b48a03f3f5441eb591.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/global_gender_gap_report_2008.pdfIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_c23811603a2a40bd8b39ccb1b3bb6215.pdf?index=trueIn PDF document text
    • https://318abaa7-a496-4882-a5ef-186b1d719b20.filesusr.com/ugd/ff2e65_299466814bca41a38ba8db74b144171a.pdf?index=trueIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_8b6468c1aa324b5bbb266e044fa69d55.pdf?index=trueIn PDF document text
    • http://lonesopuw.onlinewebshop.net/hipotiroidismo_en_el_embarazo.pdfIn PDF document text
    • http://zejibanunepi.myartsonline.com/what_does_the_color_orange_mean_on_a_mood_ring.pdfIn PDF document text
    • http://tifavamifikas.myartsonline.com/11131864969.pdfIn PDF document text
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_4f57179ba0294362ae8c275c0b9311df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/esl_pronunciation_practice.pdfIn PDF document text
    • http://bototiluwoge.atwebpages.com/how_much_does_it_cost_to_start_an_indie_game_company.pdfIn PDF document text
    • http://supajiwa.myartsonline.com/97948214683.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_off0000ec3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3C 5080 bytes
SHA-256: 1673cd195cf4b87839f380b342855cddf912e3c2c37b1a867ebb5d302618a106
font_01_sfnt_off0000fd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9B 10216 bytes
SHA-256: e89947f9e67a5c10649fdcb740f2c3ef2be31297461a53b317e70e740e281956