Malicious PDF — malware analysis report

Static analysis result for SHA-256 122af749cb89c808…

MALICIOUS

PDF

100.8 KB Created: 2021-04-21 08:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5e04b50438a9af3ff2af9abf98fcf8b9 SHA-1: b31420887d68d3a625c6784f19893357c0490c1d SHA-256: 122af749cb89c808ac2c3a8c51a7023d3b3ed182b31981b2c37b598dfec95cc4
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a phishing or SEO spam campaign. The primary malicious URL identified is https://jottigo.ru/strik?utm_term=agno3+nh3+c%25C3%25B3+hi%25E1%25BB%2587n+t%25C6%25B0%25E1%25BB%25A3ng+g%25C3%25AC, which likely serves as a redirector to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jottigo.ru/strik?utm_term=agno3+nh3+c%25C3%25B3+hi%25E1%25BB%2587n+t%25C6%25B0%25E1%25BB%25A3ng+g%25C3%25AC PDF link annotation
    • https://zonilalafujagep.weebly.com/uploads/1/3/4/7/134731182/2542403.pdfIn PDF document text
    • https://dawiganolakegoz.weebly.com/uploads/1/3/4/3/134367714/rotipekutir-mopuxagepag-fajetodam.pdfIn PDF document text
    • https://jabudebixeref.weebly.com/uploads/1/3/4/3/134398441/7399498.pdfIn PDF document text
    • http://nopuvobetag.mygamesonline.org/bulletin_de_paie_vierge.pdfIn PDF document text
    • http://pepariravifaza.getenjoyment.net/budgeting_books.pdfIn PDF document text
    • http://sifisomatexow.sportsontheweb.net/statistical_methods_by_sp_gupta_full_book.pdfIn PDF document text
    • https://banetopebored.weebly.com/uploads/1/3/4/8/134874573/xumadolu_dozomimixu_fototubusuxobor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duwemanuwixam.atwebpages.com/spanish_stories_for_beginners.pdfIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_50f2e374a6a1475997064a5a011df370.pdf?index=trueIn PDF document text
    • http://jeximojela.myartsonline.com/whirlpool_washer_drains_but_does_not_spin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fc5ac4f-aca3-488e-9b34-2e0521abd9e7/nafuwisefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2878ef49-6c94-4546-a16d-088045a1686b/does_sora_exist_no_game_no_life.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/asus_ve278h_driver.pdfIn PDF document text
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_17e055de59434deb9c58a5553ae17542.pdf?index=trueIn PDF document text
    • http://ralirajuz.atwebpages.com/digital_electronics_books_free_download.pdfIn PDF document text
    • https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_d47967d56bed4708a22f9dfde681f66e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9eaa13b-b4ce-40f5-a745-6d6554f3ce33/rebojejojinazewopowaxan.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/blade_of_the_immortal_movie_3gp.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_off000138e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E7 5344 bytes
SHA-256: 6a5759e99bf59ba2402731d445cc06bd232b4cc3794a09771ee550c49f481c46
font_01_sfnt_off00014a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A83 27392 bytes
SHA-256: 6a897b71a9cc3718de2f53f0f8e54c9751c00b56d198b3ae1be302f1eb8a9a14