Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f704af65e12aba…

MALICIOUS

PDF

77.0 KB Created: 2021-03-24 14:12:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: dcd671ab817b6d60e95cb5e3ad809f3f SHA-1: 9f796cd64f4f7b6299769d23a047a12d157c41db SHA-256: 92f704af65e12aba9350679d1ee44407b04a24cecb41eaa898f2285f6a81cee7
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded links and the document's apparent purpose of directing users to external sites are consistent with a phishing or malware distribution attack pattern.

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://fokemale.ru/strik?utm_term=saxon+math+placement+test PDF link annotation
    • https://kezikiwagoxarud.weebly.com/uploads/1/3/0/7/130739267/lufifit-mudapekifevo-lirodinod.pdfIn PDF document text
    • https://cdn.sqhk.co/koporikog/IkjgjiS/detention_officer_jobs_in_arizona.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxatotukaru/d8icujb/97005548411.pdfIn PDF document text
    • https://cdn.sqhk.co/rorezina/iiDshha/freeze_dried_dog_food_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/5njc37w/mi_pattern_lock_screen_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovebakeb/F1VX6jb/paypal_credit_customer_service_in_spanish.pdfIn PDF document text
    • https://cdn.sqhk.co/ropikenetu/Lgcgf84/super_fox_adventure_jungle_island.pdfIn PDF document text
    • https://fajevubesupuvax.weebly.com/uploads/1/3/5/3/135387480/xukufu-fuvum-robid.pdfIn PDF document text
    • https://cdn.sqhk.co/tabewinudeka/cefOjiV/50090003481.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/jobesebuvawarilin.pdfIn PDF document text
    • http://jirusulixozome.scienceontheweb.net/electronics_and_communication_engineering_books_for_1st_year.pdfIn PDF document text
    • https://cdn.sqhk.co/majukedow/gjarjej/worksheet_math_grade_4_subtraction.pdfIn PDF document text
    • http://gamukanemafutu.mywebcommunity.org/38412628687.pdfIn PDF document text
    • https://nozabuzewetuk.weebly.com/uploads/1/3/2/6/132683147/wirapizaxuroz.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/djWhdif/97788603698.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fenelepor.epizy.com/lanuvakasozasadunubev.pdfIn PDF document text
    • http://paguvano.epizy.com/somipiruzijesod.pdfIn PDF document text
    • http://dokudaruriwiv.atwebpages.com/53908069900.pdfIn PDF document text
    • http://gunimatol.epizy.com/koronus_bestiary.pdfIn PDF document text
    • http://gizixaxeviduf.myartsonline.com/10062158528.pdfIn PDF document text
    • http://buvodomugefun.rf.gd/math_154b_solving_using_the_quadratic_formula_worksheet_answer_key_with_work.pdfIn PDF document text
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_6d97e3e1a23a48559757a4f4d12be1ff.pdf?index=trueIn PDF document text
    • http://potopofekolapo.rf.gd/english_grammar_test_quiz.pdfIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_4694764174054672bdc69aa284428eda.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 5248 bytes
SHA-256: 886869be52d6a4f23c5f07d3ca782abc3c13e4e2131b52549a4310a7c46f1cc8
font_01_sfnt_off0000ff56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF56 10980 bytes
SHA-256: 4bdca2f2dbdfcd4a18da1ae2027d749d948a157b1be4cc70c1ac1563d0982747